280788480 has 240 divisors, whose sum is σ = 1112009184. Its totient is φ = 64143360.

The previous prime is 280788467. The next prime is 280788499. The reversal of 280788480 is 84887082.

It is a tau number, because it is divible by the number of its divisors (240).

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 160410 + ... + 162150.

Almost surely, 2^280788480 is an apocalyptic number.

280788480 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 280788480, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (556004592).

280788480 is an abundant number, since it is smaller than the sum of its proper divisors (831220704).

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

280788480 is a wasteful number, since it uses less digits than its factorization.

280788480 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1777 (or 1758 counting only the distinct ones).

The product of its (nonzero) digits is 229376, while the sum is 45.

The square root of 280788480 is about 16756.7443138576. The cubic root of 280788480 is about 654.8267746957.

The spelling of 280788480 in words is "two hundred eighty million, seven hundred eighty-eight thousand, four hundred eighty".