27438864 has 40 divisors (see below), whose sum is σ = 71162112. Its totient is φ = 9110400.

The previous prime is 27438863. The next prime is 27438911. The reversal of 27438864 is 46883472.

It is a super-2 number, since 2×27438864² = 1505782515220992, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (27438863) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13089 + ... + 15039.

Almost surely, 2^27438864 is an apocalyptic number.

27438864 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

27438864 is an abundant number, since it is smaller than the sum of its proper divisors (43723248).

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

27438864 is a wasteful number, since it uses less digits than its factorization.

27438864 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2255 (or 2249 counting only the distinct ones).

The product of its digits is 258048, while the sum is 42.

The square root of 27438864 is about 5238.2119086574. The cubic root of 27438864 is about 301.6166942378.

The spelling of 27438864 in words is "twenty-seven million, four hundred thirty-eight thousand, eight hundred sixty-four".