72997078 has 64 divisors (see below), whose sum is σ = 146562048. Its totient is φ = 26421120.

The previous prime is 72997061. The next prime is 72997087. The reversal of 72997078 is 87079927.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 130776 + ... + 131332.

It is an arithmetic number, because the mean of its divisors is an integer number (2290032).

Almost surely, 2^72997078 is an apocalyptic number.

72997078 is an abundant number, since it is smaller than the sum of its proper divisors (73564970).

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

72997078 is a wasteful number, since it uses less digits than its factorization.

72997078 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 637.

The product of its (nonzero) digits is 444528, while the sum is 49.

The square root of 72997078 is about 8543.8327464903. The cubic root of 72997078 is about 417.9283432947.

The spelling of 72997078 in words is "seventy-two million, nine hundred ninety-seven thousand, seventy-eight".