81264976 has 40 divisors (see below), whose sum is σ = 178495520. Its totient is φ = 35531136.

The previous prime is 81264949. The next prime is 81264977. The reversal of 81264976 is 67946218.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81264977) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6330 + ... + 14233.

It is an arithmetic number, because the mean of its divisors is an integer number (4462388).

Almost surely, 2^81264976 is an apocalyptic number.

It is an amenable number.

81264976 is an abundant number, since it is smaller than the sum of its proper divisors (97230544).

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

81264976 is a wasteful number, since it uses less digits than its factorization.

81264976 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20603 (or 20597 counting only the distinct ones).

The product of its digits is 145152, while the sum is 43.

The square root of 81264976 is about 9014.7088693978. The cubic root of 81264976 is about 433.1461619010.

The spelling of 81264976 in words is "eighty-one million, two hundred sixty-four thousand, nine hundred seventy-six".