72157506 has 16 divisors (see below), whose sum is σ = 145593504. Its totient is φ = 23839424.

The previous prime is 72157493. The next prime is 72157523. The reversal of 72157506 is 60575127.

It is a super-3 number, since 3×72157506³ (a number of 25 digits) contains 333 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 52536 + ... + 53891.

It is an arithmetic number, because the mean of its divisors is an integer number (9099594).

Almost surely, 2^72157506 is an apocalyptic number.

72157506 is an abundant number, since it is smaller than the sum of its proper divisors (73435998).

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

72157506 is a wasteful number, since it uses less digits than its factorization.

72157506 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 106545.

The product of its (nonzero) digits is 14700, while the sum is 33.

The square root of 72157506 is about 8494.5574340280. The cubic root of 72157506 is about 416.3199007861.

The spelling of 72157506 in words is "seventy-two million, one hundred fifty-seven thousand, five hundred six".