72171789 has 8 divisors (see below), whose sum is σ = 96270720. Its totient is φ = 48093696.

The previous prime is 72171773. The next prime is 72171829. The reversal of 72171789 is 98717127.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 72171789 - 2⁴ = 72171773 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 72171789.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72171739) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6892 + ... + 13850.

It is an arithmetic number, because the mean of its divisors is an integer number (12033840).

Almost surely, 2^72171789 is an apocalyptic number.

It is an amenable number.

72171789 is a deficient number, since it is larger than the sum of its proper divisors (24098931).

72171789 is a wasteful number, since it uses less digits than its factorization.

72171789 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10419.

The product of its digits is 49392, while the sum is 42.

The square root of 72171789 is about 8495.3981072108. The cubic root of 72171789 is about 416.3473680364.

The spelling of 72171789 in words is "seventy-two million, one hundred seventy-one thousand, seven hundred eighty-nine".