72997980 has 48 divisors (see below), whose sum is σ = 222977664. Its totient is φ = 17696320.

The previous prime is 72997973. The next prime is 72997987. The reversal of 72997980 is 8979927.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (72997973) and next prime (72997987).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72997987) 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, 54642 + ... + 55961.

It is an arithmetic number, because the mean of its divisors is an integer number (4645368).

Almost surely, 2^72997980 is an apocalyptic number.

It is an amenable number.

72997980 is an abundant number, since it is smaller than the sum of its proper divisors (149979684).

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

72997980 is a wasteful number, since it uses less digits than its factorization.

72997980 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 110626 (or 110624 counting only the distinct ones).

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

The square root of 72997980 is about 8543.8855329411. The cubic root of 72997980 is about 417.9300646870.

The spelling of 72997980 in words is "seventy-two million, nine hundred ninety-seven thousand, nine hundred eighty".