278990 has 16 divisors (see below), whose sum is σ = 524448. Its totient is φ = 106656.

The previous prime is 278981. The next prime is 279001. The reversal of 278990 is 99872.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 278990.

It is a congruent number.

It is an unprimeable number.

278990 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, 377 + ... + 836.

It is an arithmetic number, because the mean of its divisors is an integer number (32778).

2²⁷⁸⁹⁹⁰ is an apocalyptic number.

278990 is a deficient number, since it is larger than the sum of its proper divisors (245458).

278990 is a wasteful number, since it uses less digits than its factorization.

278990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1243.

The product of its (nonzero) digits is 9072, while the sum is 35.

The square root of 278990 is about 528.1950397344. The cubic root of 278990 is about 65.3425700764.

The spelling of 278990 in words is "two hundred seventy-eight thousand, nine hundred ninety".