72157974 has 32 divisors (see below), whose sum is σ = 170622720. Its totient is φ = 19905312.

The previous prime is 72157957. The next prime is 72157993. The reversal of 72157974 is 47975127.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 28404 + ... + 30839.

It is an arithmetic number, because the mean of its divisors is an integer number (5331960).

Almost surely, 2^72157974 is an apocalyptic number.

72157974 is an abundant number, since it is smaller than the sum of its proper divisors (98464746).

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

72157974 is a wasteful number, since it uses less digits than its factorization.

72157974 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 59284.

The product of its digits is 123480, while the sum is 42.

The square root of 72157974 is about 8494.5849810335. The cubic root of 72157974 is about 416.3208008416.

The spelling of 72157974 in words is "seventy-two million, one hundred fifty-seven thousand, nine hundred seventy-four".