81580696 has 8 divisors (see below), whose sum is σ = 152963820. Its totient is φ = 40790344.

The previous prime is 81580679. The next prime is 81580703. The reversal of 81580696 is 69608518.

It is a tau number, because it is divible by the number of its divisors (8).

It is a congruent number.

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 5098786 + ... + 5098801.

Almost surely, 2^81580696 is an apocalyptic number.

It is an amenable number.

81580696 is a deficient number, since it is larger than the sum of its proper divisors (71383124).

81580696 is a wasteful number, since it uses less digits than its factorization.

81580696 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10197593 (or 10197589 counting only the distinct ones).

The product of its (nonzero) digits is 103680, while the sum is 43.

The square root of 81580696 is about 9032.2032749490. The cubic root of 81580696 is about 433.7063712149.

The spelling of 81580696 in words is "eighty-one million, five hundred eighty thousand, six hundred ninety-six".