278719980 has 384 divisors, whose sum is σ = 1055932416. Its totient is φ = 53222400.

The previous prime is 278719967. The next prime is 278719993. The reversal of 278719980 is 89917872.

278719980 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (278719967) and next prime (278719993).

It is an unprimeable number.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 4569150 + ... + 4569210.

It is an arithmetic number, because the mean of its divisors is an integer number (2749824).

Almost surely, 2^278719980 is an apocalyptic number.

278719980 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 278719980, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (527966208).

278719980 is an abundant number, since it is smaller than the sum of its proper divisors (777212436).

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

278719980 is a wasteful number, since it uses less digits than its factorization.

278719980 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 157 (or 155 counting only the distinct ones).

The product of its (nonzero) digits is 508032, while the sum is 51.

The square root of 278719980 is about 16694.9088047824. The cubic root of 278719980 is about 653.2148270643.

The spelling of 278719980 in words is "two hundred seventy-eight million, seven hundred nineteen thousand, nine hundred eighty".