278486478 has 64 divisors (see below), whose sum is σ = 644716800. Its totient is φ = 88996320.

The previous prime is 278486441. The next prime is 278486479. The reversal of 278486478 is 874684872.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (278486479) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 254713 + ... + 255803.

It is an arithmetic number, because the mean of its divisors is an integer number (10073700).

Almost surely, 2^278486478 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 278486478, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (322358400).

278486478 is an abundant number, since it is smaller than the sum of its proper divisors (366230322).

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

278486478 is a wasteful number, since it uses less digits than its factorization.

278486478 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1294 (or 1288 counting only the distinct ones).

The product of its digits is 4816896, while the sum is 54.

The square root of 278486478 is about 16687.9141296928. The cubic root of 278486478 is about 653.0323624722.

The spelling of 278486478 in words is "two hundred seventy-eight million, four hundred eighty-six thousand, four hundred seventy-eight".