81372396 has 48 divisors (see below), whose sum is σ = 224000000. Its totient is φ = 22498560.

The previous prime is 81372373. The next prime is 81372397. The reversal of 81372396 is 69327318.

It is not an unprimeable number, because it can be changed into a prime (81372397) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 13021 + ... + 18228.

Almost surely, 2^81372396 is an apocalyptic number.

It is an amenable number.

81372396 is an abundant number, since it is smaller than the sum of its proper divisors (142627604).

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

81372396 is a wasteful number, since it uses less digits than its factorization.

81372396 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31294 (or 31292 counting only the distinct ones).

The product of its digits is 54432, while the sum is 39.

The square root of 81372396 is about 9020.6649422313. The cubic root of 81372396 is about 433.3369290957.

The spelling of 81372396 in words is "eighty-one million, three hundred seventy-two thousand, three hundred ninety-six".