28118728586 has 16 divisors (see below), whose sum is σ = 48094477704. Its totient is φ = 12214470144.

The previous prime is 28118728579. The next prime is 28118728613. The reversal of 28118728586 is 68582781182.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 13058775625 + 15059952961 = 114275^2 + 122719^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 31808075 + ... + 31808958.

Almost surely, 2^28118728586 is an apocalyptic number.

28118728586 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

28118728586 is a deficient number, since it is larger than the sum of its proper divisors (19975749118).

28118728586 is a wasteful number, since it uses less digits than its factorization.

28118728586 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 63617065.

The product of its digits is 3440640, while the sum is 56.

The spelling of 28118728586 in words is "twenty-eight billion, one hundred eighteen million, seven hundred twenty-eight thousand, five hundred eighty-six".