81538796 has 24 divisors (see below), whose sum is σ = 146603520. Its totient is φ = 39662672.

The previous prime is 81538789. The next prime is 81538801. The reversal of 81538796 is 69783518.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (47).

It is a self number, because there is not a number n which added to its sum of digits gives 81538796.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 32441 + ... + 34863.

It is an arithmetic number, because the mean of its divisors is an integer number (6108480).

Almost surely, 2^81538796 is an apocalyptic number.

It is an amenable number.

81538796 is a deficient number, since it is larger than the sum of its proper divisors (65064724).

81538796 is a wasteful number, since it uses less digits than its factorization.

81538796 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2653 (or 2651 counting only the distinct ones).

The product of its digits is 362880, while the sum is 47.

The square root of 81538796 is about 9029.8834986948. The cubic root of 81538796 is about 433.6321076949.

The spelling of 81538796 in words is "eighty-one million, five hundred thirty-eight thousand, seven hundred ninety-six".