28787172876 has 432 divisors, whose sum is σ = 99968843520. Its totient is φ = 7149098880.

The previous prime is 28787172851. The next prime is 28787172919. The reversal of 28787172876 is 67827178782.

28787172876 is a `hidden beast` number, since 287 + 8 + 71 + 7 + 287 + 6 = 666.

It is a super-2 number, since 2×28787172876² (a number of 22 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is an unprimeable number.

It is a polite number, since it can be written in 143 ways as a sum of consecutive naturals, for example, 12048690 + ... + 12051078.

It is an arithmetic number, because the mean of its divisors is an integer number (231409360).

Almost surely, 2^28787172876 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 28787172876, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (49984421760).

28787172876 is an abundant number, since it is smaller than the sum of its proper divisors (71181670644).

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

28787172876 is a wasteful number, since it uses less digits than its factorization.

28787172876 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2456 (or 2435 counting only the distinct ones).

The product of its digits is 29503488, while the sum is 63.

The spelling of 28787172876 in words is "twenty-eight billion, seven hundred eighty-seven million, one hundred seventy-two thousand, eight hundred seventy-six".