72157889 has 8 divisors (see below), whose sum is σ = 73244160. Its totient is φ = 71076096.

The previous prime is 72157873. The next prime is 72157901. The reversal of 72157889 is 98875127.

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

It is a cyclic number.

It is not a de Polignac number, because 72157889 - 2⁴ = 72157873 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (72157849) 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, 44792 + ... + 46374.

It is an arithmetic number, because the mean of its divisors is an integer number (9155520).

Almost surely, 2^72157889 is an apocalyptic number.

72157889 is a gapful number since it is divisible by the number (79) formed by its first and last digit.

It is an amenable number.

72157889 is a deficient number, since it is larger than the sum of its proper divisors (1086271).

72157889 is a wasteful number, since it uses less digits than its factorization.

72157889 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2239.

The product of its digits is 282240, while the sum is 47.

The square root of 72157889 is about 8494.5799778447. The cubic root of 72157889 is about 416.3206373703.

The spelling of 72157889 in words is "seventy-two million, one hundred fifty-seven thousand, eight hundred eighty-nine".