81798924 has 24 divisors (see below), whose sum is σ = 191070208. Its totient is φ = 27236880.

The previous prime is 81798901. The next prime is 81798947. The reversal of 81798924 is 42989718.

It is an interprime number because it is at equal distance from previous prime (81798901) and next prime (81798947).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9909 + ... + 16179.

Almost surely, 2^81798924 is an apocalyptic number.

It is an amenable number.

81798924 is an abundant number, since it is smaller than the sum of its proper divisors (109271284).

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

81798924 is a wasteful number, since it uses less digits than its factorization.

81798924 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7365 (or 7363 counting only the distinct ones).

The product of its digits is 290304, while the sum is 48.

The square root of 81798924 is about 9044.2757587327. The cubic root of 81798924 is about 434.0927477741.

The spelling of 81798924 in words is "eighty-one million, seven hundred ninety-eight thousand, nine hundred twenty-four".