72707172 has 12 divisors (see below), whose sum is σ = 169650096. Its totient is φ = 24235720.

The previous prime is 72707111. The next prime is 72707189. The reversal of 72707172 is 27170727.

It is a tau number, because it is divible by the number of its divisors (12).

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3029454 + ... + 3029477.

It is an arithmetic number, because the mean of its divisors is an integer number (14137508).

Almost surely, 2^72707172 is an apocalyptic number.

It is an amenable number.

72707172 is an abundant number, since it is smaller than the sum of its proper divisors (96942924).

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

72707172 is a wasteful number, since it uses less digits than its factorization.

72707172 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6058938 (or 6058936 counting only the distinct ones).

The product of its (nonzero) digits is 9604, while the sum is 33.

The square root of 72707172 is about 8526.8500631828. The cubic root of 72707172 is about 417.3743453953.

Adding to 72707172 its reverse (27170727), we get a palindrome (99877899).

The spelling of 72707172 in words is "seventy-two million, seven hundred seven thousand, one hundred seventy-two".