28388723258 has 32 divisors (see below), whose sum is σ = 49087254528. Its totient is φ = 12061526400.

The previous prime is 28388723219. The next prime is 28388723261. The reversal of 28388723258 is 85232788382.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2627828 + ... + 2638608.

It is an arithmetic number, because the mean of its divisors is an integer number (1533976704).

Almost surely, 2^28388723258 is an apocalyptic number.

28388723258 is a deficient number, since it is larger than the sum of its proper divisors (20698531270).

28388723258 is a wasteful number, since it uses less digits than its factorization.

28388723258 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12398.

The product of its digits is 10321920, while the sum is 56.

The spelling of 28388723258 in words is "twenty-eight billion, three hundred eighty-eight million, seven hundred twenty-three thousand, two hundred fifty-eight".