27640028 has 24 divisors (see below), whose sum is σ = 55156752. Its totient is φ = 12006144.

The previous prime is 27640001. The next prime is 27640033. The reversal of 27640028 is 82004672.

It is a super-2 number, since 2×27640028² = 1527942295681568, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14750 + ... + 16517.

It is an arithmetic number, because the mean of its divisors is an integer number (2298198).

Almost surely, 2^27640028 is an apocalyptic number.

It is an amenable number.

27640028 is a deficient number, since it is larger than the sum of its proper divisors (27516724).

27640028 is a wasteful number, since it uses less digits than its factorization.

27640028 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31301 (or 31299 counting only the distinct ones).

The product of its (nonzero) digits is 5376, while the sum is 29.

The square root of 27640028 is about 5257.3784341628. The cubic root of 27640028 is about 302.3519864188.

It can be divided in two parts, 276 and 40028, that added together give a palindrome (40304).

The spelling of 27640028 in words is "twenty-seven million, six hundred forty thousand, twenty-eight".