278478 has 28 divisors (see below), whose sum is σ = 629568. Its totient is φ = 92340.

The previous prime is 278459. The next prime is 278479. The reversal of 278478 is 874872.

Its product of digits (25088) is a multiple of the sum of its prime divisors (196).

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (278479) by changing a digit.

It is a polite number, since it can be written in 13 ways as a sum of consecutive naturals, for example, 1363 + ... + 1553.

2²⁷⁸⁴⁷⁸ is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 278478, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (314784).

278478 is an abundant number, since it is smaller than the sum of its proper divisors (351090).

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

278478 is an equidigital number, since it uses as much as digits as its factorization.

278478 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 211 (or 196 counting only the distinct ones).

The product of its digits is 25088, while the sum is 36.

The square root of 278478 is about 527.7101477137. The cubic root of 278478 is about 65.3025735622.

The spelling of 278478 in words is "two hundred seventy-eight thousand, four hundred seventy-eight".