81860826 has 16 divisors (see below), whose sum is σ = 164500128. Its totient is φ = 27157200.

The previous prime is 81860791. The next prime is 81860843. The reversal of 81860826 is 62806818.

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, 31065 + ... + 33596.

It is an arithmetic number, because the mean of its divisors is an integer number (10281258).

Almost surely, 2^81860826 is an apocalyptic number.

81860826 is an abundant number, since it is smaller than the sum of its proper divisors (82639302).

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

81860826 is a wasteful number, since it uses less digits than its factorization.

81860826 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64877.

The product of its (nonzero) digits is 36864, while the sum is 39.

The square root of 81860826 is about 9047.6972761029. The cubic root of 81860826 is about 434.2022212344.

The spelling of 81860826 in words is "eighty-one million, eight hundred sixty thousand, eight hundred twenty-six".