81579676 has 12 divisors (see below), whose sum is σ = 142881760. Its totient is φ = 40756320.

The previous prime is 81579661. The next prime is 81579677. The reversal of 81579676 is 67697518.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81579677) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2436 + ... + 13003.

Almost surely, 2^81579676 is an apocalyptic number.

It is an amenable number.

81579676 is a deficient number, since it is larger than the sum of its proper divisors (61302084).

81579676 is a wasteful number, since it uses less digits than its factorization.

81579676 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16764 (or 16762 counting only the distinct ones).

The product of its digits is 635040, while the sum is 49.

The square root of 81579676 is about 9032.1468101443. The cubic root of 81579676 is about 433.7045636699.

The spelling of 81579676 in words is "eighty-one million, five hundred seventy-nine thousand, six hundred seventy-six".