81502604 has 12 divisors (see below), whose sum is σ = 144638928. Its totient is φ = 40177200.

The previous prime is 81502579. The next prime is 81502633. The reversal of 81502604 is 40620518.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 143207 + ... + 143774.

It is an arithmetic number, because the mean of its divisors is an integer number (12053244).

Almost surely, 2^81502604 is an apocalyptic number.

It is an amenable number.

81502604 is a deficient number, since it is larger than the sum of its proper divisors (63136324).

81502604 is a wasteful number, since it uses less digits than its factorization.

81502604 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 287056 (or 287054 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 26.

The square root of 81502604 is about 9027.8792637031. The cubic root of 81502604 is about 433.5679405475.

The spelling of 81502604 in words is "eighty-one million, five hundred two thousand, six hundred four".