27989955 has 56 divisors (see below), whose sum is σ = 57605472. Its totient is φ = 12783744.

The previous prime is 27989933. The next prime is 27989971. The reversal of 27989955 is 55998972.

It is not a de Polignac number, because 27989955 - 2⁶ = 27989891 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 55 ways as a sum of consecutive naturals, for example, 24967 + ... + 26063.

Almost surely, 2^27989955 is an apocalyptic number.

27989955 is an abundant number, since it is smaller than the sum of its proper divisors (29615517).

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

27989955 is an equidigital number, since it uses as much as digits as its factorization.

27989955 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1127 (or 1112 counting only the distinct ones).

The product of its digits is 2041200, while the sum is 54.

The square root of 27989955 is about 5290.5533737030. The cubic root of 27989955 is about 303.6225803012.

The spelling of 27989955 in words is "twenty-seven million, nine hundred eighty-nine thousand, nine hundred fifty-five".