28107712404 has 18 divisors (see below), whose sum is σ = 71050050890. Its totient is φ = 9369237456.

The previous prime is 28107712393. The next prime is 28107712429. The reversal of 28107712404 is 40421770182.

It can be written as a sum of positive squares in only one way, i.e., 25010789904 + 3096922500 = 158148^2 + 55650^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is a Harshad number since it is a multiple of its sum of digits (36), and also a Moran number because the ratio is a prime number: 780769789 = 28107712404 / (2 + 8 + 1 + 0 + 7 + 7 + 1 + 2 + 4 + 0 + 4).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 390384859 + ... + 390384930.

Almost surely, 2^28107712404 is an apocalyptic number.

It is an amenable number.

28107712404 is an abundant number, since it is smaller than the sum of its proper divisors (42942338486).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

28107712404 is a wasteful number, since it uses less digits than its factorization.

28107712404 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 780769799 (or 780769794 counting only the distinct ones).

The product of its (nonzero) digits is 25088, while the sum is 36.

The spelling of 28107712404 in words is "twenty-eight billion, one hundred seven million, seven hundred twelve thousand, four hundred four".