278780 has 24 divisors (see below), whose sum is σ = 598752. Its totient is φ = 108992.

The previous prime is 278767. The next prime is 278801. The reversal of 278780 is 87872.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

278780 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, 929 + ... + 1191.

It is an arithmetic number, because the mean of its divisors is an integer number (24948).

2²⁷⁸⁷⁸⁰ is an apocalyptic number.

278780 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

278780 is an abundant number, since it is smaller than the sum of its proper divisors (319972).

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

278780 is a wasteful number, since it uses less digits than its factorization.

278780 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 325 (or 323 counting only the distinct ones).

The product of its (nonzero) digits is 6272, while the sum is 32.

The square root of 278780 is about 527.9962121076. The cubic root of 278780 is about 65.3261711803.

The spelling of 278780 in words is "two hundred seventy-eight thousand, seven hundred eighty".