28437785874 has 48 divisors (see below), whose sum is σ = 63882351000. Its totient is φ = 9131931648.

The previous prime is 28437785869. The next prime is 28437785897. The reversal of 28437785874 is 47858773482.

It is a happy number.

28437785874 is a `hidden beast` number, since 2 + 8 + 43 + 7 + 7 + 8 + 587 + 4 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 22337394849 + 6100391025 = 149457^2 + 78105^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 173712 + ... + 295044.

Almost surely, 2^28437785874 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28437785874, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31941175500).

28437785874 is an abundant number, since it is smaller than the sum of its proper divisors (35444565126).

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

28437785874 is a wasteful number, since it uses less digits than its factorization.

28437785874 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 121819 (or 121816 counting only the distinct ones).

The product of its digits is 84295680, while the sum is 63.

The spelling of 28437785874 in words is "twenty-eight billion, four hundred thirty-seven million, seven hundred eighty-five thousand, eight hundred seventy-four".