28112452578 has 36 divisors (see below), whose sum is σ = 70854857190. Its totient is φ = 8032129056.

The previous prime is 28112452561. The next prime is 28112452601. The reversal of 28112452578 is 87525421182.

28112452578 is a `hidden beast` number, since 2 + 8 + 1 + 1 + 24 + 52 + 578 = 666.

It can be written as a sum of positive squares in only one way, i.e., 28104175449 + 8277129 = 167643^2 + 2877^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 15935883 + ... + 15937646.

Almost surely, 2^28112452578 is an apocalyptic number.

28112452578 is an abundant number, since it is smaller than the sum of its proper divisors (42742404612).

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

28112452578 is a wasteful number, since it uses less digits than its factorization.

28112452578 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31873551 (or 31873541 counting only the distinct ones).

The product of its digits is 358400, while the sum is 45.

It can be divided in two parts, 28112 and 452578, that added together give a triangular number (480690 = T₉₈₀).

The spelling of 28112452578 in words is "twenty-eight billion, one hundred twelve million, four hundred fifty-two thousand, five hundred seventy-eight".