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81235864 = 2315436581
BaseRepresentation
bin1001101011110…
…00111110011000
312122212012122201
410311320332120
5131244021424
612021055544
72004331153
oct465707630
9178765581
1081235864
1141945786
12232575b4
1313aa3a78
14ab08c9a
1571e9d44
hex4d78f98

81235864 has 16 divisors (see below), whose sum is σ = 152439120. Its totient is φ = 40585440.

The previous prime is 81235859. The next prime is 81235871. The reversal of 81235864 is 46853218.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9054 + ... + 15634.

It is an arithmetic number, because the mean of its divisors is an integer number (9527445).

Almost surely, 281235864 is an apocalyptic number.

It is an amenable number.

81235864 is a deficient number, since it is larger than the sum of its proper divisors (71203256).

81235864 is a wasteful number, since it uses less digits than its factorization.

81235864 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8130 (or 8126 counting only the distinct ones).

The product of its digits is 46080, while the sum is 37.

The square root of 81235864 is about 9013.0940303538. The cubic root of 81235864 is about 433.0944329449.

The spelling of 81235864 in words is "eighty-one million, two hundred thirty-five thousand, eight hundred sixty-four".

Divisors: 1 2 4 8 1543 3086 6172 6581 12344 13162 26324 52648 10154483 20308966 40617932 81235864