72155 has 4 divisors (see below), whose sum is σ = 86592. Its totient is φ = 57720.

The previous prime is 72139. The next prime is 72161. The reversal of 72155 is 55127.

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

It is not a de Polignac number, because 72155 - 2⁴ = 72139 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7211 + ... + 7220.

It is an arithmetic number, because the mean of its divisors is an integer number (21648).

2⁷²¹⁵⁵ is an apocalyptic number.

72155 is a deficient number, since it is larger than the sum of its proper divisors (14437).

72155 is a wasteful number, since it uses less digits than its factorization.

72155 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14436.

The product of its digits is 350, while the sum is 20.

The square root of 72155 is about 268.6168274699. The cubic root of 72155 is about 41.6315081192.

The spelling of 72155 in words is "seventy-two thousand, one hundred fifty-five".