28840478868 has 96 divisors (see below), whose sum is σ = 77253872640. Its totient is φ = 9294912000.

The previous prime is 28840478819. The next prime is 28840478893. The reversal of 28840478868 is 86887404882.

28840478868 is a `hidden beast` number, since 2 + 8 + 84 + 0 + 478 + 86 + 8 = 666.

It is a super-2 number, since 2×28840478868² (a number of 22 digits) contains 22 as substring.

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, 4419448 + ... + 4425968.

It is an arithmetic number, because the mean of its divisors is an integer number (804727840).

Almost surely, 2^28840478868 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 28840478868, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (38626936320).

28840478868 is an abundant number, since it is smaller than the sum of its proper divisors (48413393772).

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

28840478868 is a wasteful number, since it uses less digits than its factorization.

28840478868 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7886 (or 7878 counting only the distinct ones).

The product of its (nonzero) digits is 44040192, while the sum is 63.

The spelling of 28840478868 in words is "twenty-eight billion, eight hundred forty million, four hundred seventy-eight thousand, eight hundred sixty-eight".