72999775 has 12 divisors (see below), whose sum is σ = 91455952. Its totient is φ = 57795840.

The previous prime is 72999739. The next prime is 72999791. The reversal of 72999775 is 57799927.

It is a de Polignac number, because none of the positive numbers 2^k-72999775 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 12627 + ... + 17476.

Almost surely, 2^72999775 is an apocalyptic number.

72999775 is a deficient number, since it is larger than the sum of its proper divisors (18456177).

72999775 is a wasteful number, since it uses less digits than its factorization.

72999775 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30210 (or 30205 counting only the distinct ones).

The product of its digits is 2500470, while the sum is 55.

The square root of 72999775 is about 8543.9905781783. The cubic root of 72999775 is about 417.9334902535.

The spelling of 72999775 in words is "seventy-two million, nine hundred ninety-nine thousand, seven hundred seventy-five".