72997566 has 8 divisors (see below), whose sum is σ = 145995144. Its totient is φ = 24332520.

The previous prime is 72997549. The next prime is 72997567. The reversal of 72997566 is 66579927.

It is a sphenic number, since it is the product of 3 distinct primes.

72997566 is an admirable number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72997567) 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, 6083125 + ... + 6083136.

It is an arithmetic number, because the mean of its divisors is an integer number (18249393).

Almost surely, 2^72997566 is an apocalyptic number.

72997566 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

72997566 is a wasteful number, since it uses less digits than its factorization.

72997566 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12166266.

The product of its digits is 1428840, while the sum is 51.

The square root of 72997566 is about 8543.8613050541. The cubic root of 72997566 is about 417.9292746040.

The spelling of 72997566 in words is "seventy-two million, nine hundred ninety-seven thousand, five hundred sixty-six".