72171790 has 16 divisors (see below), whose sum is σ = 132674112. Its totient is φ = 28254304.

The previous prime is 72171773. The next prime is 72171829. The reversal of 72171790 is 9717127.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 76309 + ... + 77248.

It is an arithmetic number, because the mean of its divisors is an integer number (8292132).

Almost surely, 2^72171790 is an apocalyptic number.

72171790 is a deficient number, since it is larger than the sum of its proper divisors (60502322).

72171790 is a wasteful number, since it uses less digits than its factorization.

72171790 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 153611.

The product of its (nonzero) digits is 6174, while the sum is 34.

The square root of 72171790 is about 8495.3981660661. The cubic root of 72171790 is about 416.3473699593.

The spelling of 72171790 in words is "seventy-two million, one hundred seventy-one thousand, seven hundred ninety".