81874818 has 24 divisors (see below), whose sum is σ = 177571056. Its totient is φ = 27264600.

The previous prime is 81874789. The next prime is 81874823. The reversal of 81874818 is 81847818.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 26073 + ... + 29043.

It is an arithmetic number, because the mean of its divisors is an integer number (7398794).

Almost surely, 2^81874818 is an apocalyptic number.

81874818 is an abundant number, since it is smaller than the sum of its proper divisors (95696238).

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

81874818 is a wasteful number, since it uses less digits than its factorization.

81874818 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4510 (or 4507 counting only the distinct ones).

The product of its digits is 114688, while the sum is 45.

The square root of 81874818 is about 9048.4704784842. The cubic root of 81874818 is about 434.2269583876.

Subtracting from 81874818 its reverse (81847818), we obtain a cube (27000 = 30³).

The spelling of 81874818 in words is "eighty-one million, eight hundred seventy-four thousand, eight hundred eighteen".