278633980 has 48 divisors (see below), whose sum is σ = 601390944. Its totient is φ = 108380160.

The previous prime is 278633969. The next prime is 278634007. The reversal of 278633980 is 89336872.

It is a self number, because there is not a number n which added to its sum of digits gives 278633980.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 241084 + ... + 242236.

It is an arithmetic number, because the mean of its divisors is an integer number (12528978).

Almost surely, 2^278633980 is an apocalyptic number.

278633980 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 278633980, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (300695472).

278633980 is an abundant number, since it is smaller than the sum of its proper divisors (322756964).

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

278633980 is a wasteful number, since it uses less digits than its factorization.

278633980 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1486 (or 1484 counting only the distinct ones).

The product of its (nonzero) digits is 435456, while the sum is 46.

The square root of 278633980 is about 16692.3329705587. The cubic root of 278633980 is about 653.1476362659.

The spelling of 278633980 in words is "two hundred seventy-eight million, six hundred thirty-three thousand, nine hundred eighty".