278225 has 12 divisors (see below), whose sum is σ = 357120. Its totient is φ = 214800.

The previous prime is 278219. The next prime is 278227. The reversal of 278225 is 522872.

It is not a de Polignac number, because 278225 - 2⁴ = 278209 is a prime.

It is a hoax number, since the sum of its digits (26) coincides with the sum of the digits of its distinct prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 278194 and 278203.

It is not an unprimeable number, because it can be changed into a prime (278227) 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, 596 + ... + 954.

It is an arithmetic number, because the mean of its divisors is an integer number (29760).

2²⁷⁸²²⁵ is an apocalyptic number.

278225 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

278225 is a deficient number, since it is larger than the sum of its proper divisors (78895).

278225 is a wasteful number, since it uses less digits than its factorization.

278225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 400 (or 395 counting only the distinct ones).

The product of its digits is 2240, while the sum is 26.

The square root of 278225 is about 527.4703783152. The cubic root of 278225 is about 65.2827915603.

The spelling of 278225 in words is "two hundred seventy-eight thousand, two hundred twenty-five".