27721872 has 40 divisors (see below), whose sum is σ = 79573280. Its totient is φ = 9240480.

The previous prime is 27721847. The next prime is 27721873. The reversal of 27721872 is 27812772.

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (27721873) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 31654 + ... + 32517.

It is an arithmetic number, because the mean of its divisors is an integer number (1989332).

Almost surely, 2^27721872 is an apocalyptic number.

It is an amenable number.

27721872 is an abundant number, since it is smaller than the sum of its proper divisors (51851408).

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

27721872 is a wasteful number, since it uses less digits than its factorization.

27721872 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64188 (or 64176 counting only the distinct ones).

The product of its digits is 21952, while the sum is 36.

The square root of 27721872 is about 5265.1564079332. The cubic root of 27721872 is about 302.6501206020.

The spelling of 27721872 in words is "twenty-seven million, seven hundred twenty-one thousand, eight hundred seventy-two".