72745172 has 12 divisors (see below), whose sum is σ = 127450176. Its totient is φ = 36330840.

The previous prime is 72745139. The next prime is 72745177. The reversal of 72745172 is 27154727.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72745177) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6338 + ... + 13625.

It is an arithmetic number, because the mean of its divisors is an integer number (10620848).

Almost surely, 2^72745172 is an apocalyptic number.

It is an amenable number.

72745172 is a deficient number, since it is larger than the sum of its proper divisors (54705004).

72745172 is a wasteful number, since it uses less digits than its factorization.

72745172 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20878 (or 20876 counting only the distinct ones).

The product of its digits is 27440, while the sum is 35.

The square root of 72745172 is about 8529.0780275479. The cubic root of 72745172 is about 417.4470455265.

Adding to 72745172 its reverse (27154727), we get a palindrome (99899899).

The spelling of 72745172 in words is "seventy-two million, seven hundred forty-five thousand, one hundred seventy-two".