28386684252 has 240 divisors, whose sum is σ = 82126420992. Its totient is φ = 8510261760.

The previous prime is 28386684229. The next prime is 28386684299. The reversal of 28386684252 is 25248668382.

It is a happy number.

28386684252 is a `hidden beast` number, since 2 + 8 + 386 + 6 + 8 + 4 + 252 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 14171083 + ... + 14173085.

Almost surely, 2^28386684252 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 28386684252, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (41063210496).

28386684252 is an abundant number, since it is smaller than the sum of its proper divisors (53739736740).

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

28386684252 is a wasteful number, since it uses less digits than its factorization.

28386684252 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2150 (or 2139 counting only the distinct ones).

The product of its digits is 8847360, while the sum is 54.

It can be divided in two parts, 2838668 and 4252, that added together give a triangular number (2842920 = T₂₃₈₄).

The spelling of 28386684252 in words is "twenty-eight billion, three hundred eighty-six million, six hundred eighty-four thousand, two hundred fifty-two".