278975256 has 64 divisors (see below), whose sum is σ = 798336000. Its totient is φ = 79580928.

The previous prime is 278975251. The next prime is 278975261. The reversal of 278975256 is 652579872.

It is an interprime number because it is at equal distance from previous prime (278975251) and next prime (278975261).

It is a junction number, because it is equal to n+sod(n) for n = 278975199 and 278975208.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (278975251) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 175441 + ... + 177023.

It is an arithmetic number, because the mean of its divisors is an integer number (12474000).

Almost surely, 2^278975256 is an apocalyptic number.

It is an amenable number.

278975256 is an abundant number, since it is smaller than the sum of its proper divisors (519360744).

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

278975256 is a wasteful number, since it uses less digits than its factorization.

278975256 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2648 (or 2644 counting only the distinct ones).

The product of its digits is 2116800, while the sum is 51.

The square root of 278975256 is about 16702.5523798011. The cubic root of 278975256 is about 653.4141898632.

It can be divided in two parts, 27897 and 5256, that added together give a triangular number (33153 = T₂₅₇).

The spelling of 278975256 in words is "two hundred seventy-eight million, nine hundred seventy-five thousand, two hundred fifty-six".