280856064 has 80 divisors (see below), whose sum is σ = 757576512. Its totient is φ = 92448768.

The previous prime is 280856047. The next prime is 280856101. The reversal of 280856064 is 460658082.

280856064 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a Smith number, since the sum of its digits (39) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 126387 + ... + 128589.

Almost surely, 2^280856064 is an apocalyptic number.

280856064 is a gapful number since it is divisible by the number (24) 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 280856064, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (378788256).

280856064 is an abundant number, since it is smaller than the sum of its proper divisors (476720448).

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

280856064 is an equidigital number, since it uses as much as digits as its factorization.

280856064 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2307 (or 2291 counting only the distinct ones).

The product of its (nonzero) digits is 92160, while the sum is 39.

The square root of 280856064 is about 16758.7608133776. The cubic root of 280856064 is about 654.8793080267.

The spelling of 280856064 in words is "two hundred eighty million, eight hundred fifty-six thousand, sixty-four".