278825 has 12 divisors (see below), whose sum is σ = 364560. Its totient is φ = 210960.

The previous prime is 278819. The next prime is 278827. The reversal of 278825 is 528872.

278825 = 20² + 21² + ... + 94².

It is not a de Polignac number, because 278825 - 2⁴ = 278809 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 278791 and 278800.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 278825.

It is not an unprimeable number, because it can be changed into a prime (278827) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 182 + ... + 768.

It is an arithmetic number, because the mean of its divisors is an integer number (30380).

2²⁷⁸⁸²⁵ is an apocalyptic number.

278825 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

278825 is a deficient number, since it is larger than the sum of its proper divisors (85735).

278825 is a wasteful number, since it uses less digits than its factorization.

278825 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 616 (or 611 counting only the distinct ones).

The product of its digits is 8960, while the sum is 32.

The square root of 278825 is about 528.0388243302. The cubic root of 278825 is about 65.3296859225.

Subtracting 278825 from its reverse (528872), we obtain a cube (250047 = 63³).

The spelling of 278825 in words is "two hundred seventy-eight thousand, eight hundred twenty-five".