81504996 has 12 divisors (see below), whose sum is σ = 190178352. Its totient is φ = 27168328.

The previous prime is 81504961. The next prime is 81505009. The reversal of 81504996 is 69940518.

81504996 is digitally balanced in base 9, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (12).

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors.

81504996 is strictly pandigital in base 9.

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, 3396030 + ... + 3396053.

It is an arithmetic number, because the mean of its divisors is an integer number (15848196).

Almost surely, 2^81504996 is an apocalyptic number.

It is an amenable number.

81504996 is an abundant number, since it is smaller than the sum of its proper divisors (108673356).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

81504996 is a wasteful number, since it uses less digits than its factorization.

81504996 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6792090 (or 6792088 counting only the distinct ones).

The product of its (nonzero) digits is 77760, while the sum is 42.

The square root of 81504996 is about 9028.0117412418. The cubic root of 81504996 is about 433.5721820659.

The spelling of 81504996 in words is "eighty-one million, five hundred four thousand, nine hundred ninety-six".