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81241224 = 23319717183
BaseRepresentation
bin1001101011110…
…10010010001000
312122212111000020
410311322102020
5131244204344
612021140440
72004352611
oct465722210
9178774006
1081241224
1141949809
122325a720
1313aa633c
14ab0ac08
1571eb719
hex4d7a488

81241224 has 32 divisors (see below), whose sum is σ = 204145920. Its totient is φ = 26941376.

The previous prime is 81241219. The next prime is 81241229. The reversal of 81241224 is 42214218.

It is an interprime number because it is at equal distance from previous prime (81241219) and next prime (81241229).

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a nude number because it is divisible by every one of its digits.

It is a cake number, because a cake can be divided into 81241224 parts by 787 planar cuts.

It is a junction number, because it is equal to n+sod(n) for n = 81241194 and 81241203.

It is not an unprimeable number, because it can be changed into a prime (81241229) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3864 + ... + 13319.

It is an arithmetic number, because the mean of its divisors is an integer number (6379560).

Almost surely, 281241224 is an apocalyptic number.

It is an amenable number.

81241224 is an abundant number, since it is smaller than the sum of its proper divisors (122904696).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

81241224 is a wasteful number, since it uses less digits than its factorization.

81241224 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17389 (or 17385 counting only the distinct ones).

The product of its digits is 1024, while the sum is 24.

The square root of 81241224 is about 9013.3913706218. The cubic root of 81241224 is about 433.1039580282.

The spelling of 81241224 in words is "eighty-one million, two hundred forty-one thousand, two hundred twenty-four".

Divisors: 1 2 3 4 6 8 12 24 197 394 591 788 1182 1576 2364 4728 17183 34366 51549 68732 103098 137464 206196 412392 3385051 6770102 10155153 13540204 20310306 27080408 40620612 81241224