81502804 has 12 divisors (see below), whose sum is σ = 142731904. Its totient is φ = 40722264.

The previous prime is 81502781. The next prime is 81502843. The reversal of 81502804 is 40820518.

It is a hoax number, since the sum of its digits (28) 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 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, 234 + ... + 12769.

Almost surely, 2^81502804 is an apocalyptic number.

It is an amenable number.

81502804 is a deficient number, since it is larger than the sum of its proper divisors (61229100).

81502804 is a wasteful number, since it uses less digits than its factorization.

81502804 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14574 (or 14572 counting only the distinct ones).

The product of its (nonzero) digits is 2560, while the sum is 28.

The square root of 81502804 is about 9027.8903404948. The cubic root of 81502804 is about 433.5682951927.

The spelling of 81502804 in words is "eighty-one million, five hundred two thousand, eight hundred four".