280497880 has 128 divisors (see below), whose sum is σ = 725760000. Its totient is φ = 96763392.

The previous prime is 280497869. The next prime is 280497881. The reversal of 280497880 is 88794082.

It is a Harshad number since it is a multiple of its sum of digits (46).

It is a self number, because there is not a number n which added to its sum of digits gives 280497880.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (280497881) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 561871 + ... + 562369.

It is an arithmetic number, because the mean of its divisors is an integer number (5670000).

Almost surely, 2^280497880 is an apocalyptic number.

280497880 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 280497880, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (362880000).

280497880 is an abundant number, since it is smaller than the sum of its proper divisors (445262120).

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

280497880 is a wasteful number, since it uses less digits than its factorization.

280497880 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 593 (or 589 counting only the distinct ones).

The product of its (nonzero) digits is 258048, while the sum is 46.

The square root of 280497880 is about 16748.0709336926. The cubic root of 280497880 is about 654.6007939790.

The spelling of 280497880 in words is "two hundred eighty million, four hundred ninety-seven thousand, eight hundred eighty".