27881495820 has 72 divisors (see below), whose sum is σ = 84766762080. Its totient is φ = 7418108160.

The previous prime is 27881495819. The next prime is 27881495849. The reversal of 27881495820 is 2859418872.

27881495820 is a `hidden beast` number, since 2 + 78 + 8 + 1 + 495 + 82 + 0 = 666.

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, 97401 + ... + 255440.

It is an arithmetic number, because the mean of its divisors is an integer number (1177316140).

Almost surely, 2^27881495820 is an apocalyptic number.

27881495820 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

27881495820 is an abundant number, since it is smaller than the sum of its proper divisors (56885266260).

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

27881495820 is a wasteful number, since it uses less digits than its factorization.

27881495820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 353295 (or 353290 counting only the distinct ones).

The product of its (nonzero) digits is 2580480, while the sum is 54.

The spelling of 27881495820 in words is "twenty-seven billion, eight hundred eighty-one million, four hundred ninety-five thousand, eight hundred twenty".