278722560 has 192 divisors, whose sum is σ = 916755840. Its totient is φ = 72253440.

The previous prime is 278722559. The next prime is 278722573. The reversal of 278722560 is 65227872.

It is a tau number, because it is divible by the number of its divisors (192).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1320855 + ... + 1321065.

It is an arithmetic number, because the mean of its divisors is an integer number (4774770).

Almost surely, 2^278722560 is an apocalyptic number.

278722560 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 278722560, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (458377920).

278722560 is an abundant number, since it is smaller than the sum of its proper divisors (638033280).

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

278722560 is a wasteful number, since it uses less digits than its factorization.

278722560 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 284 (or 264 counting only the distinct ones).

The product of its (nonzero) digits is 94080, while the sum is 39.

The square root of 278722560 is about 16694.9860736689. The cubic root of 278722560 is about 653.2168425747.

The spelling of 278722560 in words is "two hundred seventy-eight million, seven hundred twenty-two thousand, five hundred sixty".