27800854820 has 12 divisors (see below), whose sum is σ = 58381795164. Its totient is φ = 11120341920.

The previous prime is 27800854799. The next prime is 27800854849. The reversal of 27800854820 is 2845800872.

It can be written as a sum of positive squares in 2 ways, for example, as 11744923876 + 16055930944 = 108374^2 + 126712^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 695021351 + ... + 695021390.

It is an arithmetic number, because the mean of its divisors is an integer number (4865149597).

Almost surely, 2^27800854820 is an apocalyptic number.

27800854820 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

27800854820 is an abundant number, since it is smaller than the sum of its proper divisors (30580940344).

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

27800854820 is a wasteful number, since it uses less digits than its factorization.

27800854820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1390042750 (or 1390042748 counting only the distinct ones).

The product of its (nonzero) digits is 286720, while the sum is 44.

The spelling of 27800854820 in words is "twenty-seven billion, eight hundred million, eight hundred fifty-four thousand, eight hundred twenty".