72661626 has 12 divisors (see below), whose sum is σ = 157433562. Its totient is φ = 24220536.

The previous prime is 72661619. The next prime is 72661637. The reversal of 72661626 is 62616627.

72661626 is a `hidden beast` number, since 7 + 26 + 6 + 1 + 626 = 666.

It can be written as a sum of positive squares in only one way, i.e., 37271025 + 35390601 = 6105^2 + 5949^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2018361 + ... + 2018396.

Almost surely, 2^72661626 is an apocalyptic number.

72661626 is an abundant number, since it is smaller than the sum of its proper divisors (84771936).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

72661626 is a wasteful number, since it uses less digits than its factorization.

72661626 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4036765 (or 4036762 counting only the distinct ones).

The product of its digits is 36288, while the sum is 36.

The square root of 72661626 is about 8524.1789047392. The cubic root of 72661626 is about 417.2871751651.

The spelling of 72661626 in words is "seventy-two million, six hundred sixty-one thousand, six hundred twenty-six".