72331553 has 8 divisors (see below), whose sum is σ = 82751040. Its totient is φ = 61933680.

The previous prime is 72331529. The next prime is 72331561. The reversal of 72331553 is 35513327.

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 72331553 - 2⁶ = 72331489 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (72331513) 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, 2558 + ... + 12296.

It is an arithmetic number, because the mean of its divisors is an integer number (10343880).

Almost surely, 2^72331553 is an apocalyptic number.

It is an amenable number.

72331553 is a deficient number, since it is larger than the sum of its proper divisors (10419487).

72331553 is a wasteful number, since it uses less digits than its factorization.

72331553 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10807.

The product of its digits is 9450, while the sum is 29.

The square root of 72331553 is about 8504.7958823243. The cubic root of 72331553 is about 416.6543591742.

The spelling of 72331553 in words is "seventy-two million, three hundred thirty-one thousand, five hundred fifty-three".