81375976 has 16 divisors (see below), whose sum is σ = 166451040. Its totient is φ = 36989040.

The previous prime is 81375967. The next prime is 81375977. The reversal of 81375976 is 67957318.

It is not an unprimeable number, because it can be changed into a prime (81375977) 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, 462276 + ... + 462451.

It is an arithmetic number, because the mean of its divisors is an integer number (10403190).

Almost surely, 2^81375976 is an apocalyptic number.

It is an amenable number.

81375976 is an abundant number, since it is smaller than the sum of its proper divisors (85075064).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

81375976 is a wasteful number, since it uses less digits than its factorization.

81375976 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 924744 (or 924740 counting only the distinct ones).

The product of its digits is 317520, while the sum is 46.

The square root of 81375976 is about 9020.8633733141. The cubic root of 81375976 is about 433.3432839267.

The spelling of 81375976 in words is "eighty-one million, three hundred seventy-five thousand, nine hundred seventy-six".