72164612 has 12 divisors (see below), whose sum is σ = 136002636. Its totient is φ = 33306720.

The previous prime is 72164597. The next prime is 72164623. The reversal of 72164612 is 21646127.

It can be written as a sum of positive squares in 2 ways, for example, as 5317636 + 66846976 = 2306^2 + 8176^2 .

It is a super-2 number, since 2×72164612² = 10415462450221088, which contains 22 as substring.

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, 693839 + ... + 693942.

It is an arithmetic number, because the mean of its divisors is an integer number (11333553).

Almost surely, 2^72164612 is an apocalyptic number.

It is an amenable number.

72164612 is a deficient number, since it is larger than the sum of its proper divisors (63838024).

72164612 is a wasteful number, since it uses less digits than its factorization.

72164612 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1387798 (or 1387796 counting only the distinct ones).

The product of its digits is 4032, while the sum is 29.

The square root of 72164612 is about 8494.9756915485. The cubic root of 72164612 is about 416.3335665952. Note that the first 3 decimals are identical.

The spelling of 72164612 in words is "seventy-two million, one hundred sixty-four thousand, six hundred twelve".