81256804 has 24 divisors (see below), whose sum is σ = 151508448. Its totient is φ = 37998720.

The previous prime is 81256801. The next prime is 81256817. The reversal of 81256804 is 40865218.

It is a hoax number, since the sum of its digits (34) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (34).

It is a self number, because there is not a number n which added to its sum of digits gives 81256804.

It is not an unprimeable number, because it can be changed into a prime (81256801) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7419 + ... + 14749.

It is an arithmetic number, because the mean of its divisors is an integer number (6312852).

Almost surely, 2^81256804 is an apocalyptic number.

It is an amenable number.

81256804 is a deficient number, since it is larger than the sum of its proper divisors (70251644).

81256804 is a wasteful number, since it uses less digits than its factorization.

81256804 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7515 (or 7513 counting only the distinct ones).

The product of its (nonzero) digits is 15360, while the sum is 34.

The square root of 81256804 is about 9014.2555987724. The cubic root of 81256804 is about 433.1316423655.

The spelling of 81256804 in words is "eighty-one million, two hundred fifty-six thousand, eight hundred four".