81797884 has 24 divisors (see below), whose sum is σ = 164323040. Its totient is φ = 34900416.

The previous prime is 81797879. The next prime is 81797927. The reversal of 81797884 is 48879718.

It is a congruent number.

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, 34 + ... + 12790.

Almost surely, 2^81797884 is an apocalyptic number.

It is an amenable number.

81797884 is an abundant number, since it is smaller than the sum of its proper divisors (82525156).

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

81797884 is a wasteful number, since it uses less digits than its factorization.

81797884 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12997 (or 12995 counting only the distinct ones).

The product of its digits is 903168, while the sum is 52.

The square root of 81797884 is about 9044.2182636201. The cubic root of 81797884 is about 434.0909080662.

The spelling of 81797884 in words is "eighty-one million, seven hundred ninety-seven thousand, eight hundred eighty-four".