27972855 has 12 divisors (see below), whose sum is σ = 48486360. Its totient is φ = 14918832.

The previous prime is 27972821. The next prime is 27972863. The reversal of 27972855 is 55827972.

It is a happy number.

It is not a de Polignac number, because 27972855 - 2⁷ = 27972727 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45), and also a Moran number because the ratio is a prime number: 621619 = 27972855 / (2 + 7 + 9 + 7 + 2 + 8 + 5 + 5).

It is a self number, because there is not a number n which added to its sum of digits gives 27972855.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 310765 + ... + 310854.

It is an arithmetic number, because the mean of its divisors is an integer number (4040530).

Almost surely, 2^27972855 is an apocalyptic number.

27972855 is a deficient number, since it is larger than the sum of its proper divisors (20513505).

27972855 is a wasteful number, since it uses less digits than its factorization.

27972855 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 621630 (or 621627 counting only the distinct ones).

The product of its digits is 352800, while the sum is 45.

The square root of 27972855 is about 5288.9370387631. The cubic root of 27972855 is about 303.5607366411.

The spelling of 27972855 in words is "twenty-seven million, nine hundred seventy-two thousand, eight hundred fifty-five".