278478452 has 24 divisors (see below), whose sum is σ = 557376960. Its totient is φ = 119257920.

The previous prime is 278478451. The next prime is 278478469. The reversal of 278478452 is 254874872.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 278478397 and 278478406.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (278478451) 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, 45299 + ... + 51077.

It is an arithmetic number, because the mean of its divisors is an integer number (23224040).

Almost surely, 2^278478452 is an apocalyptic number.

It is an amenable number.

278478452 is an abundant number, since it is smaller than the sum of its proper divisors (278898508).

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

278478452 is a wasteful number, since it uses less digits than its factorization.

278478452 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7511 (or 7509 counting only the distinct ones).

The product of its digits is 1003520, while the sum is 47.

The square root of 278478452 is about 16687.6736545272. The cubic root of 278478452 is about 653.0260889323.

The spelling of 278478452 in words is "two hundred seventy-eight million, four hundred seventy-eight thousand, four hundred fifty-two".