27900861864 has 48 divisors (see below), whose sum is σ = 70131684000. Its totient is φ = 9249723648.

The previous prime is 27900861799. The next prime is 27900861869. The reversal of 27900861864 is 46816800972.

It is not an unprimeable number, because it can be changed into a prime (27900861869) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 11542384 + ... + 11544800.

It is an arithmetic number, because the mean of its divisors is an integer number (1461076750).

Almost surely, 2^27900861864 is an apocalyptic number.

27900861864 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

27900861864 is an abundant number, since it is smaller than the sum of its proper divisors (42230822136).

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

27900861864 is an equidigital number, since it uses as much as digits as its factorization.

27900861864 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5042 (or 2621 counting only the distinct ones).

The product of its (nonzero) digits is 1161216, while the sum is 51.

The spelling of 27900861864 in words is "twenty-seven billion, nine hundred million, eight hundred sixty-one thousand, eight hundred sixty-four".