278464 has 28 divisors (see below), whose sum is σ = 584200. Its totient is φ = 131328.

The previous prime is 278459. The next prime is 278479. The reversal of 278464 is 464872.

It is a nialpdrome in base 13.

It is a congruent number.

It is an unprimeable number.

278464 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 3 ways as a sum of consecutive naturals, for example, 1102 + ... + 1330.

2²⁷⁸⁴⁶⁴ is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 278464, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (292100).

278464 is an abundant number, since it is smaller than the sum of its proper divisors (305736).

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

278464 is a wasteful number, since it uses less digits than its factorization.

278464 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 260 (or 250 counting only the distinct ones).

The product of its digits is 10752, while the sum is 31.

The square root of 278464 is about 527.6968826893. The cubic root of 278464 is about 65.3014792192.

The spelling of 278464 in words is "two hundred seventy-eight thousand, four hundred sixty-four".