81696984 has 16 divisors (see below), whose sum is σ = 204242520. Its totient is φ = 27232320.

The previous prime is 81696977. The next prime is 81697013. The reversal of 81696984 is 48969618.

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, 1701997 + ... + 1702044.

Almost surely, 2^81696984 is an apocalyptic number.

It is an amenable number.

81696984 is an abundant number, since it is smaller than the sum of its proper divisors (122545536).

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

81696984 is a wasteful number, since it uses less digits than its factorization.

81696984 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3404050 (or 3404046 counting only the distinct ones).

The product of its digits is 746496, while the sum is 51.

The square root of 81696984 is about 9038.6383930324. The cubic root of 81696984 is about 433.9123468278.

The spelling of 81696984 in words is "eighty-one million, six hundred ninety-six thousand, nine hundred eighty-four".