72557871 has 4 divisors (see below), whose sum is σ = 96743832. Its totient is φ = 48371912.

The previous prime is 72557869. The next prime is 72557879. The reversal of 72557871 is 17875527.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 72557871 - 2¹ = 72557869 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72557879) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12092976 + ... + 12092981.

It is an arithmetic number, because the mean of its divisors is an integer number (24185958).

Almost surely, 2^72557871 is an apocalyptic number.

72557871 is a deficient number, since it is larger than the sum of its proper divisors (24185961).

72557871 is a wasteful number, since it uses less digits than its factorization.

72557871 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24185960.

The product of its digits is 137200, while the sum is 42.

The square root of 72557871 is about 8518.0908072173. The cubic root of 72557871 is about 417.0884629646.

The spelling of 72557871 in words is "seventy-two million, five hundred fifty-seven thousand, eight hundred seventy-one".