27438644 has 24 divisors (see below), whose sum is σ = 49888608. Its totient is φ = 13194720.

The previous prime is 27438643. The next prime is 27438661. The reversal of 27438644 is 44683472.

It is a Smith number, since the sum of its digits (38) coincides with the sum of the digits of its prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 27438598 and 27438607.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (27438643) 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, 10334 + ... + 12714.

It is an arithmetic number, because the mean of its divisors is an integer number (2078692).

Almost surely, 2^27438644 is an apocalyptic number.

It is an amenable number.

27438644 is a deficient number, since it is larger than the sum of its proper divisors (22449964).

27438644 is a wasteful number, since it uses less digits than its factorization.

27438644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2495 (or 2493 counting only the distinct ones).

The product of its digits is 129024, while the sum is 38.

The square root of 27438644 is about 5238.1909090830. The cubic root of 27438644 is about 301.6158881324.

It can be divided in two parts, 27438 and 644, that added together give a palindrome (28082).

The spelling of 27438644 in words is "twenty-seven million, four hundred thirty-eight thousand, six hundred forty-four".