278540 has 24 divisors (see below), whose sum is σ = 616560. Its totient is φ = 105408.

The previous prime is 278503. The next prime is 278543. The reversal of 278540 is 45872.

278540 = T₂₄ + T₂₅ + ... + T₁₁₈.

278540 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (278543) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14 + ... + 746.

It is an arithmetic number, because the mean of its divisors is an integer number (25690).

2²⁷⁸⁵⁴⁰ is an apocalyptic number.

278540 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 278540, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (308280).

278540 is an abundant number, since it is smaller than the sum of its proper divisors (338020).

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

278540 is a wasteful number, since it uses less digits than its factorization.

278540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 761 (or 759 counting only the distinct ones).

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

The square root of 278540 is about 527.7688888140. The cubic root of 278540 is about 65.3074194975.

It can be divided in two parts, 278 and 540, that added together give a palindrome (818).

The spelling of 278540 in words is "two hundred seventy-eight thousand, five hundred forty".