27978957 has 36 divisors (see below), whose sum is σ = 44443776. Its totient is φ = 16940160.

The previous prime is 27978943. The next prime is 27978967. The reversal of 27978957 is 75987972.

It is not a de Polignac number, because 27978957 - 2⁷ = 27978829 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (27978967) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 80458 + ... + 80804.

Almost surely, 2^27978957 is an apocalyptic number.

It is an amenable number.

27978957 is a deficient number, since it is larger than the sum of its proper divisors (16464819).

27978957 is a wasteful number, since it uses less digits than its factorization.

27978957 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 418 (or 398 counting only the distinct ones).

The product of its digits is 2222640, while the sum is 54.

The square root of 27978957 is about 5289.5138718033. The cubic root of 27978957 is about 303.5828079544.

The spelling of 27978957 in words is "twenty-seven million, nine hundred seventy-eight thousand, nine hundred fifty-seven".