72855989 has 4 divisors (see below), whose sum is σ = 73733856. Its totient is φ = 71978124.

The previous prime is 72855967. The next prime is 72856027. The reversal of 72855989 is 98955827.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 72855989 - 2²⁰ = 71807413 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 72855989.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72855949) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 438809 + ... + 438974.

It is an arithmetic number, because the mean of its divisors is an integer number (18433464).

Almost surely, 2^72855989 is an apocalyptic number.

It is an amenable number.

72855989 is a deficient number, since it is larger than the sum of its proper divisors (877867).

72855989 is an equidigital number, since it uses as much as digits as its factorization.

72855989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 877866.

The product of its digits is 1814400, while the sum is 53.

The square root of 72855989 is about 8535.5719784910. The cubic root of 72855989 is about 417.6589118608.

The spelling of 72855989 in words is "seventy-two million, eight hundred fifty-five thousand, nine hundred eighty-nine".