28385674920 has 96 divisors (see below), whose sum is σ = 92395485000. Its totient is φ = 7557858816.

The previous prime is 28385674907. The next prime is 28385674973. The reversal of 28385674920 is 2947658382.

28385674920 is a `hidden beast` number, since 2 + 8 + 38 + 567 + 49 + 2 + 0 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 17141617476 + 11244057444 = 130926^2 + 106038^2 .

It is a Smith number, since the sum of its digits (54) coincides with the sum of the digits of its prime factors.

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, 174706 + ... + 295454.

Almost surely, 2^28385674920 is an apocalyptic number.

28385674920 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28385674920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (46197742500).

28385674920 is an abundant number, since it is smaller than the sum of its proper divisors (64009810080).

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

28385674920 is a wasteful number, since it uses less digits than its factorization.

28385674920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 121419 (or 121412 counting only the distinct ones).

The product of its (nonzero) digits is 5806080, while the sum is 54.

The spelling of 28385674920 in words is "twenty-eight billion, three hundred eighty-five million, six hundred seventy-four thousand, nine hundred twenty".