81696792 has 16 divisors (see below), whose sum is σ = 204242040. Its totient is φ = 27232256.

The previous prime is 81696787. The next prime is 81696793. The reversal of 81696792 is 29769618.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81696793) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1701993 + ... + 1702040.

Almost surely, 2^81696792 is an apocalyptic number.

It is an amenable number.

81696792 is an abundant number, since it is smaller than the sum of its proper divisors (122545248).

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

81696792 is a wasteful number, since it uses less digits than its factorization.

81696792 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3404042 (or 3404038 counting only the distinct ones).

The product of its digits is 326592, while the sum is 48.

The square root of 81696792 is about 9038.6277719574. The cubic root of 81696792 is about 433.9120069082.

The spelling of 81696792 in words is "eighty-one million, six hundred ninety-six thousand, seven hundred ninety-two".