72157930 has 24 divisors (see below), whose sum is σ = 140647212. Its totient is φ = 26642304.

The previous prime is 72157927. The next prime is 72157933. The reversal of 72157930 is 3975127.

It is an interprime number because it is at equal distance from previous prime (72157927) and next prime (72157933).

It can be written as a sum of positive squares in 6 ways, for example, as 1042441 + 71115489 = 1021^2 + 8433^2 .

It is not an unprimeable number, because it can be changed into a prime (72157933) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 19659 + ... + 23038.

Almost surely, 2^72157930 is an apocalyptic number.

72157930 is a deficient number, since it is larger than the sum of its proper divisors (68489282).

72157930 is a wasteful number, since it uses less digits than its factorization.

72157930 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42730 (or 42717 counting only the distinct ones).

The product of its (nonzero) digits is 13230, while the sum is 34.

The square root of 72157930 is about 8494.5823911479. The cubic root of 72157930 is about 416.3207162212.

The spelling of 72157930 in words is "seventy-two million, one hundred fifty-seven thousand, nine hundred thirty".