27399978 has 32 divisors (see below), whose sum is σ = 61528320. Its totient is φ = 9037440.

The previous prime is 27399959. The next prime is 27399989. The reversal of 27399978 is 87999372.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 2623 + ... + 7853.

It is an arithmetic number, because the mean of its divisors is an integer number (1922760).

Almost surely, 2^27399978 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 27399978, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30764160).

27399978 is an abundant number, since it is smaller than the sum of its proper divisors (34128342).

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

27399978 is a wasteful number, since it uses less digits than its factorization.

27399978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5339 (or 5333 counting only the distinct ones).

The product of its digits is 1714608, while the sum is 54.

The square root of 27399978 is about 5234.4988298786. The cubic root of 27399978 is about 301.4741444623.

The spelling of 27399978 in words is "twenty-seven million, three hundred ninety-nine thousand, nine hundred seventy-eight".