81715404 has 12 divisors (see below), whose sum is σ = 190669304. Its totient is φ = 27238464.

The previous prime is 81715399. The next prime is 81715421. The reversal of 81715404 is 40451718.

It is a tau number, because it is divible by the number of its divisors (12).

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, 3404797 + ... + 3404820.

Almost surely, 2^81715404 is an apocalyptic number.

It is an amenable number.

81715404 is an abundant number, since it is smaller than the sum of its proper divisors (108953900).

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

81715404 is a wasteful number, since it uses less digits than its factorization.

81715404 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6809624 (or 6809622 counting only the distinct ones).

The product of its (nonzero) digits is 4480, while the sum is 30.

The square root of 81715404 is about 9039.6572943890. The cubic root of 81715404 is about 433.9449553951.

The spelling of 81715404 in words is "eighty-one million, seven hundred fifteen thousand, four hundred four".