278520480 has 144 divisors (see below), whose sum is σ = 1086269184. Its totient is φ = 63659520.

The previous prime is 278520383. The next prime is 278520491. The reversal of 278520480 is 84025872.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (144).

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3736 + ... + 23895.

It is an arithmetic number, because the mean of its divisors is an integer number (7543536).

Almost surely, 2^278520480 is an apocalyptic number.

278520480 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 278520480, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (543134592).

278520480 is an abundant number, since it is smaller than the sum of its proper divisors (807748704).

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

278520480 is a wasteful number, since it uses less digits than its factorization.

278520480 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27659 (or 27648 counting only the distinct ones).

The product of its (nonzero) digits is 35840, while the sum is 36.

The square root of 278520480 is about 16688.9328598326. The cubic root of 278520480 is about 653.0589388706.

The spelling of 278520480 in words is "two hundred seventy-eight million, five hundred twenty thousand, four hundred eighty".