27187998 has 16 divisors (see below), whose sum is σ = 57574800. Its totient is φ = 8529536.

The previous prime is 27187991. The next prime is 27188027. The reversal of 27187998 is 89978172.

It is a Harshad number since it is a multiple of its sum of digits (51).

It is a self number, because there is not a number n which added to its sum of digits gives 27187998.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (27187991) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 133173 + ... + 133376.

It is an arithmetic number, because the mean of its divisors is an integer number (3598425).

Almost surely, 2^27187998 is an apocalyptic number.

27187998 is an abundant number, since it is smaller than the sum of its proper divisors (30386802).

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

27187998 is a wasteful number, since it uses less digits than its factorization.

27187998 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 266571.

The product of its digits is 508032, while the sum is 51.

The square root of 27187998 is about 5214.2111579797. The cubic root of 27187998 is about 300.6946790507.

The spelling of 27187998 in words is "twenty-seven million, one hundred eighty-seven thousand, nine hundred ninety-eight".