28345183812 has 72 divisors (see below), whose sum is σ = 78288555072. Its totient is φ = 8575761600.

The previous prime is 28345183787. The next prime is 28345183829. The reversal of 28345183812 is 21838154382.

28345183812 is a `hidden beast` number, since 28 + 34 + 518 + 3 + 81 + 2 = 666.

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, 193158 + ... + 306594.

Almost surely, 2^28345183812 is an apocalyptic number.

28345183812 is a gapful number since it is divisible by the number (22) 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 28345183812, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (39144277536).

28345183812 is an abundant number, since it is smaller than the sum of its proper divisors (49943371260).

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

28345183812 is a wasteful number, since it uses less digits than its factorization.

28345183812 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 114089 (or 114084 counting only the distinct ones).

The product of its digits is 368640, while the sum is 45.

The spelling of 28345183812 in words is "twenty-eight billion, three hundred forty-five million, one hundred eighty-three thousand, eight hundred twelve".