72000172 has 12 divisors (see below), whose sum is σ = 126090216. Its totient is φ = 35974400.

The previous prime is 72000169. The next prime is 72000209. The reversal of 72000172 is 27100027.

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 in 3 ways as a sum of consecutive naturals, for example, 783 + ... + 12025.

It is an arithmetic number, because the mean of its divisors is an integer number (10507518).

Almost surely, 2^72000172 is an apocalyptic number.

It is an amenable number.

72000172 is a deficient number, since it is larger than the sum of its proper divisors (54090044).

72000172 is a wasteful number, since it uses less digits than its factorization.

72000172 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12848 (or 12846 counting only the distinct ones).

The product of its (nonzero) digits is 196, while the sum is 19.

The square root of 72000172 is about 8485.2915094297. The cubic root of 72000172 is about 416.0170958827.

Adding to 72000172 its reverse (27100027), we get a palindrome (99100199).

The spelling of 72000172 in words is "seventy-two million, one hundred seventy-two", and thus it is an aban number.