27939408 has 80 divisors (see below), whose sum is σ = 84220800. Its totient is φ = 7977984.

The previous prime is 27939389. The next prime is 27939413. The reversal of 27939408 is 80493972.

It is a super-2 number, since 2×27939408² = 1561221038780928, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a self number, because there is not a number n which added to its sum of digits gives 27939408.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 15616 + ... + 17312.

It is an arithmetic number, because the mean of its divisors is an integer number (1052760).

Almost surely, 2^27939408 is an apocalyptic number.

27939408 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 27939408, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (42110400).

27939408 is an abundant number, since it is smaller than the sum of its proper divisors (56281392).

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

27939408 is a wasteful number, since it uses less digits than its factorization.

27939408 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1729 (or 1709 counting only the distinct ones).

The product of its (nonzero) digits is 108864, while the sum is 42.

The square root of 27939408 is about 5285.7741154915. The cubic root of 27939408 is about 303.4396997125.

The spelling of 27939408 in words is "twenty-seven million, nine hundred thirty-nine thousand, four hundred eight".