72625666 has 16 divisors (see below), whose sum is σ = 116494200. Its totient is φ = 33836800.

The previous prime is 72625661. The next prime is 72625673. The reversal of 72625666 is 66652627.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 70207641 + 2418025 = 8379^2 + 1555^2 .

It is not an unprimeable number, because it can be changed into a prime (72625661) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7141 + ... + 14008.

Almost surely, 2^72625666 is an apocalyptic number.

72625666 is a deficient number, since it is larger than the sum of its proper divisors (43868534).

72625666 is a wasteful number, since it uses less digits than its factorization.

72625666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21269.

The product of its digits is 181440, while the sum is 40.

The square root of 72625666 is about 8522.0693496357. The cubic root of 72625666 is about 417.2183257887.

The spelling of 72625666 in words is "seventy-two million, six hundred twenty-five thousand, six hundred sixty-six".