81896768 has 28 divisors (see below), whose sum is σ = 166298880. Its totient is φ = 39994752.

The previous prime is 81896743. The next prime is 81896777. The reversal of 81896768 is 86769818.

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, 12128 + ... + 17631.

Almost surely, 2^81896768 is an apocalyptic number.

It is an amenable number.

81896768 is an abundant number, since it is smaller than the sum of its proper divisors (84402112).

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

81896768 is a wasteful number, since it uses less digits than its factorization.

81896768 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29814 (or 29804 counting only the distinct ones).

The product of its digits is 1161216, while the sum is 53.

The square root of 81896768 is about 9049.6833093761. The cubic root of 81896768 is about 434.2657592071.

The spelling of 81896768 in words is "eighty-one million, eight hundred ninety-six thousand, seven hundred sixty-eight".