80997972 has 48 divisors (see below), whose sum is σ = 206721984. Its totient is φ = 24480000.

The previous prime is 80997971. The next prime is 80997991. The reversal of 80997972 is 27979908.

It is a happy number.

It is a super-2 number, since 2×80997972² = 13121342936225568, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (80997971) 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, 78822 + ... + 79842.

It is an arithmetic number, because the mean of its divisors is an integer number (4306708).

Almost surely, 2^80997972 is an apocalyptic number.

It is an amenable number.

80997972 is an abundant number, since it is smaller than the sum of its proper divisors (125724012).

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

80997972 is a wasteful number, since it uses less digits than its factorization.

80997972 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1640 (or 1638 counting only the distinct ones).

The product of its (nonzero) digits is 571536, while the sum is 51.

The square root of 80997972 is about 8999.8873326281. The cubic root of 80997972 is about 432.6712600965.

The spelling of 80997972 in words is "eighty million, nine hundred ninety-seven thousand, nine hundred seventy-two".