81313708 has 12 divisors (see below), whose sum is σ = 162627472. Its totient is φ = 34848720.

The previous prime is 81313667. The next prime is 81313723. The reversal of 81313708 is 80731318.

81313708 is an admirable number.

It is a super-2 number, since 2×81313708² = 13223838217418528, which contains 22 as substring.

It is a hoax number, since the sum of its digits (31) coincides with the sum of the digits of its distinct prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 81313708.

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, 1452003 + ... + 1452058.

Almost surely, 2^81313708 is an apocalyptic number.

It is an amenable number.

81313708 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

81313708 is a wasteful number, since it uses less digits than its factorization.

81313708 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2904072 (or 2904070 counting only the distinct ones).

The product of its (nonzero) digits is 4032, while the sum is 31.

The square root of 81313708 is about 9017.4113802133. The cubic root of 81313708 is about 433.2327258876.

The spelling of 81313708 in words is "eighty-one million, three hundred thirteen thousand, seven hundred eight".