278530 has 32 divisors (see below), whose sum is σ = 601344. Its totient is φ = 90816.

The previous prime is 278503. The next prime is 278543. The reversal of 278530 is 35872.

It is a junction number, because it is equal to n+sod(n) for n = 278495 and 278504.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (3) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1524 + ... + 1696.

It is an arithmetic number, because the mean of its divisors is an integer number (18792).

2²⁷⁸⁵³⁰ is an apocalyptic number.

278530 is an abundant number, since it is smaller than the sum of its proper divisors (322814).

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

278530 is a wasteful number, since it uses less digits than its factorization.

278530 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 210.

The product of its (nonzero) digits is 1680, while the sum is 25.

The square root of 278530 is about 527.7594148852. The cubic root of 278530 is about 65.3066379437.

It can be divided in two parts, 278 and 530, that added together give a palindrome (808).

The spelling of 278530 in words is "two hundred seventy-eight thousand, five hundred thirty".