72170972 has 6 divisors (see below), whose sum is σ = 126299208. Its totient is φ = 36085484.

The previous prime is 72170951. The next prime is 72170977. The reversal of 72170972 is 27907127.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72170977) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9021368 + ... + 9021375.

It is an arithmetic number, because the mean of its divisors is an integer number (21049868).

Almost surely, 2^72170972 is an apocalyptic number.

It is an amenable number.

72170972 is a deficient number, since it is larger than the sum of its proper divisors (54128236).

72170972 is a wasteful number, since it uses less digits than its factorization.

72170972 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18042747 (or 18042745 counting only the distinct ones).

The product of its (nonzero) digits is 12348, while the sum is 35.

The square root of 72170972 is about 8495.3500222180. The cubic root of 72170972 is about 416.3457969836.

The spelling of 72170972 in words is "seventy-two million, one hundred seventy thousand, nine hundred seventy-two".