81892912 has 10 divisors (see below), whose sum is σ = 158667548. Its totient is φ = 40946448.

The previous prime is 81892879. The next prime is 81892913. The reversal of 81892912 is 21929818.

It is not an unprimeable number, because it can be changed into a prime (81892913) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2559138 + ... + 2559169.

Almost surely, 2^81892912 is an apocalyptic number.

It is an amenable number.

81892912 is a deficient number, since it is larger than the sum of its proper divisors (76774636).

81892912 is a wasteful number, since it uses less digits than its factorization.

81892912 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5118315 (or 5118309 counting only the distinct ones).

The product of its digits is 20736, while the sum is 40.

The square root of 81892912 is about 9049.4702607390. The cubic root of 81892912 is about 434.2589434923.

The spelling of 81892912 in words is "eighty-one million, eight hundred ninety-two thousand, nine hundred twelve".