278553 has 16 divisors (see below), whose sum is σ = 423936. Its totient is φ = 161040.

The previous prime is 278549. The next prime is 278557. The reversal of 278553 is 355872.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (278549) and next prime (278557).

It is not a de Polignac number, because 278553 - 2² = 278549 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 278553.

It is not an unprimeable number, because it can be changed into a prime (278557) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (5) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 576 + ... + 942.

It is an arithmetic number, because the mean of its divisors is an integer number (26496).

2²⁷⁸⁵⁵³ is an apocalyptic number.

278553 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

It is an amenable number.

278553 is a deficient number, since it is larger than the sum of its proper divisors (145383).

278553 is a wasteful number, since it uses less digits than its factorization.

278553 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 404.

The product of its digits is 8400, while the sum is 30.

The square root of 278553 is about 527.7812046672. The cubic root of 278553 is about 65.3084354895.

The spelling of 278553 in words is "two hundred seventy-eight thousand, five hundred fifty-three".