81715796 has 12 divisors (see below), whose sum is σ = 143314752. Its totient is φ = 40768728.

The previous prime is 81715763. The next prime is 81715841. The reversal of 81715796 is 69751718.

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, 20210 + ... + 23913.

It is an arithmetic number, because the mean of its divisors is an integer number (11942896).

Almost surely, 2^81715796 is an apocalyptic number.

It is an amenable number.

81715796 is a deficient number, since it is larger than the sum of its proper divisors (61598956).

81715796 is a wasteful number, since it uses less digits than its factorization.

81715796 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44590 (or 44588 counting only the distinct ones).

The product of its digits is 105840, while the sum is 44.

The square root of 81715796 is about 9039.6789766009. The cubic root of 81715796 is about 433.9456492919.

The spelling of 81715796 in words is "eighty-one million, seven hundred fifteen thousand, seven hundred ninety-six".