72257789 has 4 divisors (see below), whose sum is σ = 75399456. Its totient is φ = 69116124.

The previous prime is 72257777. The next prime is 72257813. The reversal of 72257789 is 98775227.

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 a de Polignac number, because none of the positive numbers 2^k-72257789 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72257719) 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, 1570799 + ... + 1570844.

It is an arithmetic number, because the mean of its divisors is an integer number (18849864).

Almost surely, 2^72257789 is an apocalyptic number.

It is an amenable number.

72257789 is a deficient number, since it is larger than the sum of its proper divisors (3141667).

72257789 is a wasteful number, since it uses less digits than its factorization.

72257789 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3141666.

The product of its digits is 493920, while the sum is 47.

The square root of 72257789 is about 8500.4581641227. The cubic root of 72257789 is about 416.5126757531.

The spelling of 72257789 in words is "seventy-two million, two hundred fifty-seven thousand, seven hundred eighty-nine".