27721144 has 16 divisors (see below), whose sum is σ = 56702520. Its totient is φ = 12600480.

The previous prime is 27721139. The next prime is 27721147. The reversal of 27721144 is 44112772.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (27721147) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 157419 + ... + 157594.

Almost surely, 2^27721144 is an apocalyptic number.

It is an amenable number.

27721144 is an abundant number, since it is smaller than the sum of its proper divisors (28981376).

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

27721144 is a wasteful number, since it uses less digits than its factorization.

27721144 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 315030 (or 315026 counting only the distinct ones).

The product of its digits is 3136, while the sum is 28.

The square root of 27721144 is about 5265.0872737306. The cubic root of 27721144 is about 302.6474712954.

It can be divided in two parts, 2772 and 1144, that added together give a triangular number (3916 = T₈₈).

The spelling of 27721144 in words is "twenty-seven million, seven hundred twenty-one thousand, one hundred forty-four".