72157970 has 8 divisors (see below), whose sum is σ = 129884364. Its totient is φ = 28863184.

The previous prime is 72157957. The next prime is 72157993. The reversal of 72157970 is 7975127.

It can be written as a sum of positive squares in 2 ways, for example, as 69338929 + 2819041 = 8327^2 + 1679^2 .

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

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3607889 + ... + 3607908.

Almost surely, 2^72157970 is an apocalyptic number.

72157970 is a deficient number, since it is larger than the sum of its proper divisors (57726394).

72157970 is a wasteful number, since it uses less digits than its factorization.

72157970 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7215804.

The product of its (nonzero) digits is 30870, while the sum is 38.

The square root of 72157970 is about 8494.5847455894. The cubic root of 72157970 is about 416.3207931488.

The spelling of 72157970 in words is "seventy-two million, one hundred fifty-seven thousand, nine hundred seventy".