27981628 has 6 divisors (see below), whose sum is σ = 48967856. Its totient is φ = 13990812.

The previous prime is 27981619. The next prime is 27981641. The reversal of 27981628 is 82618972.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3497700 + ... + 3497707.

Almost surely, 2^27981628 is an apocalyptic number.

It is an amenable number.

27981628 is a deficient number, since it is larger than the sum of its proper divisors (20986228).

27981628 is a wasteful number, since it uses less digits than its factorization.

27981628 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6995411 (or 6995409 counting only the distinct ones).

The product of its digits is 96768, while the sum is 43.

The square root of 27981628 is about 5289.7663464467. The cubic root of 27981628 is about 303.5924681177.

The spelling of 27981628 in words is "twenty-seven million, nine hundred eighty-one thousand, six hundred twenty-eight".