72331155 has 36 divisors (see below), whose sum is σ = 135774288. Its totient is φ = 35605440.

The previous prime is 72331151. The next prime is 72331169. The reversal of 72331155 is 55113327.

It is not a de Polignac number, because 72331155 - 2² = 72331151 is a prime.

It is not an unprimeable number, because it can be changed into a prime (72331151) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 2850 + ... + 12360.

It is an arithmetic number, because the mean of its divisors is an integer number (3771508).

Almost surely, 2^72331155 is an apocalyptic number.

72331155 is a deficient number, since it is larger than the sum of its proper divisors (63443133).

72331155 is a wasteful number, since it uses less digits than its factorization.

72331155 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9548 (or 9532 counting only the distinct ones).

The product of its digits is 3150, while the sum is 27.

The square root of 72331155 is about 8504.7724837294. The cubic root of 72331155 is about 416.6535949677.

It can be divided in two parts, 723 and 31155, that added together give a triangular number (31878 = T₂₅₂).

The spelling of 72331155 in words is "seventy-two million, three hundred thirty-one thousand, one hundred fifty-five".