28687999452 has 96 divisors (see below), whose sum is σ = 84029030400. Its totient is φ = 7427547072.

The previous prime is 28687999421. The next prime is 28687999463. The reversal of 28687999452 is 25499978682.

It is a Harshad number since it is a multiple of its sum of digits (69).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 354052 + ... + 427467.

It is an arithmetic number, because the mean of its divisors is an integer number (875302400).

Almost surely, 2^28687999452 is an apocalyptic number.

It is an amenable number.

28687999452 is an abundant number, since it is smaller than the sum of its proper divisors (55341030948).

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

28687999452 is a wasteful number, since it uses less digits than its factorization.

28687999452 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 781575 (or 781573 counting only the distinct ones).

The product of its digits is 156764160, while the sum is 69.

The spelling of 28687999452 in words is "twenty-eight billion, six hundred eighty-seven million, nine hundred ninety-nine thousand, four hundred fifty-two".