28115140864 has 144 divisors (see below), whose sum is σ = 62774510400. Its totient is φ = 12508618752.

The previous prime is 28115140819. The next prime is 28115140873. The reversal of 28115140864 is 46804151182.

It is a super-2 number, since 2×28115140864² (a number of 22 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5216379 + ... + 5221765.

It is an arithmetic number, because the mean of its divisors is an integer number (435934100).

Almost surely, 2^28115140864 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 28115140864, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31387255200).

28115140864 is an abundant number, since it is smaller than the sum of its proper divisors (34659369536).

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

28115140864 is a wasteful number, since it uses less digits than its factorization.

28115140864 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5488 (or 5474 counting only the distinct ones).

The product of its (nonzero) digits is 61440, while the sum is 40.

The spelling of 28115140864 in words is "twenty-eight billion, one hundred fifteen million, one hundred forty thousand, eight hundred sixty-four".