28774518939 has 12 divisors (see below), whose sum is σ = 42996408000. Its totient is φ = 18521529264.

The previous prime is 28774518809. The next prime is 28774518991. The reversal of 28774518939 is 93981547782.

28774518939 is a `hidden beast` number, since 2 + 8 + 77 + 451 + 89 + 39 = 666.

It is not a de Polignac number, because 28774518939 - 2¹² = 28774514843 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28774518139) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 55123339 + ... + 55123860.

It is an arithmetic number, because the mean of its divisors is an integer number (3583034000).

Almost surely, 2^28774518939 is an apocalyptic number.

28774518939 is a gapful number since it is divisible by the number (29) formed by its first and last digit.

28774518939 is a deficient number, since it is larger than the sum of its proper divisors (14221889061).

28774518939 is a wasteful number, since it uses less digits than its factorization.

28774518939 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 110247234 (or 110247231 counting only the distinct ones).

The product of its digits is 30481920, while the sum is 63.

The spelling of 28774518939 in words is "twenty-eight billion, seven hundred seventy-four million, five hundred eighteen thousand, nine hundred thirty-nine".