278428980 has 96 divisors (see below), whose sum is σ = 812851200. Its totient is φ = 71130240.

The previous prime is 278428973. The next prime is 278428993. The reversal of 278428980 is 89824872.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 198321 + ... + 199719.

It is an arithmetic number, because the mean of its divisors is an integer number (8467200).

Almost surely, 2^278428980 is an apocalyptic number.

278428980 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 278428980, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (406425600).

278428980 is an abundant number, since it is smaller than the sum of its proper divisors (534422220).

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

278428980 is a wasteful number, since it uses less digits than its factorization.

278428980 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1549 (or 1547 counting only the distinct ones).

The product of its (nonzero) digits is 516096, while the sum is 48.

The square root of 278428980 is about 16686.1912969976. The cubic root of 278428980 is about 652.9874163771.

The spelling of 278428980 in words is "two hundred seventy-eight million, four hundred twenty-eight thousand, nine hundred eighty".