81007204 has 12 divisors (see below), whose sum is σ = 142879744. Its totient is φ = 40184424.

The previous prime is 81007187. The next prime is 81007211. The reversal of 81007204 is 40270018.

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, 79224 + ... + 80239.

Almost surely, 2^81007204 is an apocalyptic number.

It is an amenable number.

81007204 is a deficient number, since it is larger than the sum of its proper divisors (61872540).

81007204 is a wasteful number, since it uses less digits than its factorization.

81007204 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 159594 (or 159592 counting only the distinct ones).

The product of its (nonzero) digits is 448, while the sum is 22.

The square root of 81007204 is about 9000.4002133238. The cubic root of 81007204 is about 432.6876978304.

The spelling of 81007204 in words is "eighty-one million, seven thousand, two hundred four".