81288604 has 12 divisors (see below), whose sum is σ = 142711744. Its totient is φ = 40513824.

The previous prime is 81288583. The next prime is 81288617. The reversal of 81288604 is 40688218.

It is a hoax number, since the sum of its digits (37) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

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, 31212 + ... + 33715.

Almost surely, 2^81288604 is an apocalyptic number.

It is an amenable number.

81288604 is a deficient number, since it is larger than the sum of its proper divisors (61423140).

81288604 is a wasteful number, since it uses less digits than its factorization.

81288604 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 65244 (or 65242 counting only the distinct ones).

The product of its (nonzero) digits is 24576, while the sum is 37.

The square root of 81288604 is about 9016.0192990033. The cubic root of 81288604 is about 433.1881372852.

The spelling of 81288604 in words is "eighty-one million, two hundred eighty-eight thousand, six hundred four".