279664 has 40 divisors (see below), whose sum is σ = 678528. Its totient is φ = 108480.

The previous prime is 279659. The next prime is 279679. The reversal of 279664 is 466972.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1119 + ... + 1345.

2²⁷⁹⁶⁶⁴ is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 279664, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (339264).

279664 is an abundant number, since it is smaller than the sum of its proper divisors (398864).

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

279664 is a wasteful number, since it uses less digits than its factorization.

279664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 253 (or 247 counting only the distinct ones).

The product of its digits is 18144, while the sum is 34.

The square root of 279664 is about 528.8326767514. The cubic root of 279664 is about 65.3951471989.

The spelling of 279664 in words is "two hundred seventy-nine thousand, six hundred sixty-four".