27880515198 has 32 divisors (see below), whose sum is σ = 63955307520. Its totient is φ = 8993714040.

The previous prime is 27880515191. The next prime is 27880515209. The reversal of 27880515198 is 89151508872.

27880515198 is a `hidden beast` number, since 2 + 78 + 8 + 0 + 51 + 519 + 8 = 666.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (27880515191) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8325840 + ... + 8329187.

It is an arithmetic number, because the mean of its divisors is an integer number (1998603360).

Almost surely, 2^27880515198 is an apocalyptic number.

27880515198 is an abundant number, since it is smaller than the sum of its proper divisors (36074792322).

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

27880515198 is a wasteful number, since it uses less digits than its factorization.

27880515198 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16655069 (or 16655063 counting only the distinct ones).

The product of its (nonzero) digits is 1612800, while the sum is 54.

The spelling of 27880515198 in words is "twenty-seven billion, eight hundred eighty million, five hundred fifteen thousand, one hundred ninety-eight".