28147312404 has 30 divisors (see below), whose sum is σ = 73582635434. Its totient is φ = 9382437360.

The previous prime is 28147312379. The next prime is 28147312409. The reversal of 28147312404 is 40421374182.

It can be written as a sum of positive squares in only one way, i.e., 16268492304 + 11878820100 = 127548^2 + 108990^2 .

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28147312409) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 43436887 + ... + 43437534.

Almost surely, 2^28147312404 is an apocalyptic number.

It is an amenable number.

28147312404 is an abundant number, since it is smaller than the sum of its proper divisors (45435323030).

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

28147312404 is a wasteful number, since it uses less digits than its factorization.

28147312404 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 86874437 (or 86874426 counting only the distinct ones).

The product of its (nonzero) digits is 43008, while the sum is 36.

Adding to 28147312404 its reverse (40421374182), we get a palindrome (68568686586).

The spelling of 28147312404 in words is "twenty-eight billion, one hundred forty-seven million, three hundred twelve thousand, four hundred four".