81364912 has 20 divisors (see below), whose sum is σ = 157810336. Its totient is φ = 40639680.

The previous prime is 81364891. The next prime is 81364919. The reversal of 81364912 is 21946318.

It is not an unprimeable number, because it can be changed into a prime (81364919) by changing a digit.

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, 17737 + ... + 21847.

Almost surely, 2^81364912 is an apocalyptic number.

It is an amenable number.

81364912 is a deficient number, since it is larger than the sum of its proper divisors (76445424).

81364912 is a wasteful number, since it uses less digits than its factorization.

81364912 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5356 (or 5350 counting only the distinct ones).

The product of its digits is 10368, while the sum is 34.

The square root of 81364912 is about 9020.2501073972. The cubic root of 81364912 is about 433.3236437018.

The spelling of 81364912 in words is "eighty-one million, three hundred sixty-four thousand, nine hundred twelve".