72557373 has 8 divisors (see below), whose sum is σ = 110563648. Its totient is φ = 41461344.

The previous prime is 72557369. The next prime is 72557389. The reversal of 72557373 is 37375527.

It is a happy number.

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

It is not a de Polignac number, because 72557373 - 2² = 72557369 is a prime.

It is a super-2 number, since 2×72557373² = 10529144753322258, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72557273) 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 7 ways as a sum of consecutive naturals, for example, 1727536 + ... + 1727577.

It is an arithmetic number, because the mean of its divisors is an integer number (13820456).

Almost surely, 2^72557373 is an apocalyptic number.

It is an amenable number.

72557373 is a deficient number, since it is larger than the sum of its proper divisors (38006275).

72557373 is a wasteful number, since it uses less digits than its factorization.

72557373 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3455123.

The product of its digits is 154350, while the sum is 39.

The square root of 72557373 is about 8518.0615752646. The cubic root of 72557373 is about 417.0875087354.

The spelling of 72557373 in words is "seventy-two million, five hundred fifty-seven thousand, three hundred seventy-three".