72157874 has 4 divisors (see below), whose sum is σ = 108236814. Its totient is φ = 36078936.

The previous prime is 72157873. The next prime is 72157901. The reversal of 72157874 is 47875127.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 47875127 = 1381 ⋅34667.

It can be written as a sum of positive squares in only one way, i.e., 65691025 + 6466849 = 8105^2 + 2543^2 .

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (72157873) by changing a digit.

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 as a sum of consecutive naturals, namely, 18039467 + ... + 18039470.

Almost surely, 2^72157874 is an apocalyptic number.

72157874 is a deficient number, since it is larger than the sum of its proper divisors (36078940).

72157874 is a wasteful number, since it uses less digits than its factorization.

72157874 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36078939.

The product of its digits is 109760, while the sum is 41.

The square root of 72157874 is about 8494.5790949287. The cubic root of 72157874 is about 416.3206085224.

The spelling of 72157874 in words is "seventy-two million, one hundred fifty-seven thousand, eight hundred seventy-four".