27731664 has 30 divisors (see below), whose sum is σ = 77610546. Its totient is φ = 9243840.

The previous prime is 27731653. The next prime is 27731699. The reversal of 27731664 is 46613772.

It can be written as a sum of positive squares in only one way, i.e., 27123264 + 608400 = 5208^2 + 780^2 .

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 96147 + ... + 96434.

Almost surely, 2^27731664 is an apocalyptic number.

27731664 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

27731664 is an abundant number, since it is smaller than the sum of its proper divisors (49878882).

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

27731664 is a wasteful number, since it uses less digits than its factorization.

27731664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 192595 (or 192586 counting only the distinct ones).

The product of its digits is 42336, while the sum is 36.

The square root of 27731664 is about 5266.0862127390. The cubic root of 27731664 is about 302.6857507249.

The spelling of 27731664 in words is "twenty-seven million, seven hundred thirty-one thousand, six hundred sixty-four".