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8181072 = 243256813
BaseRepresentation
bin11111001101010101010000
3120101122022200
4133031111100
54043243242
6451203200
7126352344
oct37152520
916348280
108181072
114688619
1228a6500
131905993
14112d624
15ab904c
hex7cd550

8181072 has 30 divisors (see below), whose sum is σ = 22896042. Its totient is φ = 2726976.

The previous prime is 8181071. The next prime is 8181073. The reversal of 8181072 is 2701818.

It is an interprime number because it is at equal distance from previous prime (8181071) and next prime (8181073).

It can be written as a sum of positive squares in only one way, i.e., 8156736 + 24336 = 2856^2 + 156^2 .

It is an alternating number because its digits alternate between even and odd.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8181071) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 28263 + ... + 28550.

Almost surely, 28181072 is an apocalyptic number.

It is an amenable number.

8181072 is an abundant number, since it is smaller than the sum of its proper divisors (14714970).

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

8181072 is a wasteful number, since it uses less digits than its factorization.

8181072 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 56827 (or 56818 counting only the distinct ones).

The product of its (nonzero) digits is 896, while the sum is 27.

The square root of 8181072 is about 2860.2573310805. The cubic root of 8181072 is about 201.4976899620.

The spelling of 8181072 in words is "eight million, one hundred eighty-one thousand, seventy-two".