28637137044 has 18 divisors (see below), whose sum is σ = 72388318730. Its totient is φ = 9545712336.

The previous prime is 28637137027. The next prime is 28637137057. The reversal of 28637137044 is 44073173682.

28637137044 is a `hidden beast` number, since 2 + 8 + 637 + 1 + 3 + 7 + 0 + 4 + 4 = 666.

It can be written as a sum of positive squares in only one way, i.e., 28163552400 + 473584644 = 167820^2 + 21762^2 .

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

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, 397737979 + ... + 397738050.

Almost surely, 2^28637137044 is an apocalyptic number.

It is an amenable number.

28637137044 is an abundant number, since it is smaller than the sum of its proper divisors (43751181686).

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

28637137044 is a wasteful number, since it uses less digits than its factorization.

28637137044 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 795476039 (or 795476034 counting only the distinct ones).

The product of its (nonzero) digits is 677376, while the sum is 45.

The spelling of 28637137044 in words is "twenty-eight billion, six hundred thirty-seven million, one hundred thirty-seven thousand, forty-four".