28707537684 has 216 divisors, whose sum is σ = 83244231840. Its totient is φ = 7656259968.

The previous prime is 28707537643. The next prime is 28707537757. The reversal of 28707537684 is 48673570782.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (57).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 76963722 + ... + 76964094.

Almost surely, 2^28707537684 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28707537684, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (41622115920).

28707537684 is an abundant number, since it is smaller than the sum of its proper divisors (54536694156).

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

28707537684 is a wasteful number, since it uses less digits than its factorization.

28707537684 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 579 (or 487 counting only the distinct ones).

The product of its (nonzero) digits is 15805440, while the sum is 57.

The spelling of 28707537684 in words is "twenty-eight billion, seven hundred seven million, five hundred thirty-seven thousand, six hundred eighty-four".