278992 has 40 divisors (see below), whose sum is σ = 642816. Its totient is φ = 114816.

The previous prime is 278981. The next prime is 279001. The reversal of 278992 is 299872.

It is a congruent number.

It is an unprimeable number.

278992 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5238 + ... + 5290.

2²⁷⁸⁹⁹² 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 278992, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (321408).

278992 is an abundant number, since it is smaller than the sum of its proper divisors (363824).

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

278992 is a wasteful number, since it uses less digits than its factorization.

278992 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 115 (or 109 counting only the distinct ones).

The product of its digits is 18144, while the sum is 37.

The square root of 278992 is about 528.1969329710. The cubic root of 278992 is about 65.3427262168.

The spelling of 278992 in words is "two hundred seventy-eight thousand, nine hundred ninety-two".