27774640 has 20 divisors (see below), whose sum is σ = 64576224. Its totient is φ = 11109824.

The previous prime is 27774623. The next prime is 27774661. The reversal of 27774640 is 4647772.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (20).

It is a self number, because there is not a number n which added to its sum of digits gives 27774640.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 173512 + ... + 173671.

Almost surely, 2^27774640 is an apocalyptic number.

27774640 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

27774640 is an abundant number, since it is smaller than the sum of its proper divisors (36801584).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

27774640 is a wasteful number, since it uses less digits than its factorization.

27774640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 347196 (or 347190 counting only the distinct ones).

The product of its (nonzero) digits is 65856, while the sum is 37.

The square root of 27774640 is about 5270.1650828034. The cubic root of 27774640 is about 302.8420282681.

The spelling of 27774640 in words is "twenty-seven million, seven hundred seventy-four thousand, six hundred forty".