72577531 has 8 divisors (see below), whose sum is σ = 78732864. Its totient is φ = 66504000.

The previous prime is 72577529. The next prime is 72577559. The reversal of 72577531 is 13577527.

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

It is a cyclic number.

It is not a de Polignac number, because 72577531 - 2¹ = 72577529 is a prime.

It is a super-2 number, since 2×72577531² = 10534996012111922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (72577591) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 18595 + ... + 22156.

It is an arithmetic number, because the mean of its divisors is an integer number (9841608).

Almost surely, 2^72577531 is an apocalyptic number.

72577531 is a deficient number, since it is larger than the sum of its proper divisors (6155333).

72577531 is a wasteful number, since it uses less digits than its factorization.

72577531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40901.

The product of its digits is 51450, while the sum is 37.

The square root of 72577531 is about 8519.2447435204. The cubic root of 72577531 is about 417.1261304548.

The spelling of 72577531 in words is "seventy-two million, five hundred seventy-seven thousand, five hundred thirty-one".