27979885 has 16 divisors (see below), whose sum is σ = 34594560. Its totient is φ = 21712320.

The previous prime is 27979883. The next prime is 27979901. The reversal of 27979885 is 58897972.

It is not a de Polignac number, because 27979885 - 2¹ = 27979883 is a prime.

It is a super-2 number, since 2×27979885² = 1565747929226450, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (27979883) 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, 38556 + ... + 39274.

It is an arithmetic number, because the mean of its divisors is an integer number (2162160).

Almost surely, 2^27979885 is an apocalyptic number.

It is an amenable number.

27979885 is a deficient number, since it is larger than the sum of its proper divisors (6614675).

27979885 is a wasteful number, since it uses less digits than its factorization.

27979885 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 948.

The product of its digits is 2540160, while the sum is 55.

The square root of 27979885 is about 5289.6015918025. The cubic root of 27979885 is about 303.5861643069.

The spelling of 27979885 in words is "twenty-seven million, nine hundred seventy-nine thousand, eight hundred eighty-five".