81679496 has 16 divisors (see below), whose sum is σ = 153251340. Its totient is φ = 40812480.

The previous prime is 81679487. The next prime is 81679501. The reversal of 81679496 is 69497618.

It can be written as a sum of positive squares in 2 ways, for example, as 79459396 + 2220100 = 8914^2 + 1490^2 .

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, 15470 + ... + 20066.

Almost surely, 2^81679496 is an apocalyptic number.

It is an amenable number.

81679496 is a deficient number, since it is larger than the sum of its proper divisors (71571844).

81679496 is a wasteful number, since it uses less digits than its factorization.

81679496 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6824 (or 6820 counting only the distinct ones).

The product of its digits is 653184, while the sum is 50.

The square root of 81679496 is about 9037.6709389090. The cubic root of 81679496 is about 433.8813836259.

The spelling of 81679496 in words is "eighty-one million, six hundred seventy-nine thousand, four hundred ninety-six".