72173008 has 10 divisors (see below), whose sum is σ = 139835234. Its totient is φ = 36086496.

The previous prime is 72172999. The next prime is 72173029. The reversal of 72173008 is 80037127.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 39087504 + 33085504 = 6252^2 + 5752^2 .

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2255391 + ... + 2255422.

Almost surely, 2^72173008 is an apocalyptic number.

It is an amenable number.

72173008 is a deficient number, since it is larger than the sum of its proper divisors (67662226).

72173008 is a wasteful number, since it uses less digits than its factorization.

72173008 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4510821 (or 4510815 counting only the distinct ones).

The product of its (nonzero) digits is 2352, while the sum is 28.

The square root of 72173008 is about 8495.4698516327. The cubic root of 72173008 is about 416.3497120944.

The spelling of 72173008 in words is "seventy-two million, one hundred seventy-three thousand, eight".