278620 has 12 divisors (see below), whose sum is σ = 585144. Its totient is φ = 111440.

The previous prime is 278617. The next prime is 278623. The reversal of 278620 is 26872.

It is an interprime number because it is at equal distance from previous prime (278617) and next prime (278623).

It is an Ulam number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (278623) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6946 + ... + 6985.

It is an arithmetic number, because the mean of its divisors is an integer number (48762).

2²⁷⁸⁶²⁰ is an apocalyptic number.

278620 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

278620 is an abundant number, since it is smaller than the sum of its proper divisors (306524).

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

278620 is a wasteful number, since it uses less digits than its factorization.

278620 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13940 (or 13938 counting only the distinct ones).

The product of its (nonzero) digits is 1344, while the sum is 25.

The square root of 278620 is about 527.8446741230. The cubic root of 278620 is about 65.3136712548.

It can be divided in two parts, 278 and 620, that added together give a palindrome (898).

The spelling of 278620 in words is "two hundred seventy-eight thousand, six hundred twenty".