72523155 has 32 divisors (see below), whose sum is σ = 119496960. Its totient is φ = 37537920.

The previous prime is 72523147. The next prime is 72523177. The reversal of 72523155 is 55132527.

It is not a de Polignac number, because 72523155 - 2³ = 72523147 is a prime.

It is a super-2 number, since 2×72523155² = 10519216022308050, which contains 22 as substring.

It is an unprimeable number.

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 31 ways as a sum of consecutive naturals, for example, 147460 + ... + 147950.

It is an arithmetic number, because the mean of its divisors is an integer number (3734280).

Almost surely, 2^72523155 is an apocalyptic number.

72523155 is a deficient number, since it is larger than the sum of its proper divisors (46973805).

72523155 is a wasteful number, since it uses less digits than its factorization.

72523155 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 771.

The product of its digits is 10500, while the sum is 30.

The square root of 72523155 is about 8516.0527828331. The cubic root of 72523155 is about 417.0219323787.

The spelling of 72523155 in words is "seventy-two million, five hundred twenty-three thousand, one hundred fifty-five".