280780280 has 64 divisors (see below), whose sum is σ = 691286400. Its totient is φ = 101791360.

The previous prime is 280780277. The next prime is 280780289. The reversal of 280780280 is 82087082.

It is a self number, because there is not a number n which added to its sum of digits gives 280780280.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (280780289) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 183599 + ... + 185121.

It is an arithmetic number, because the mean of its divisors is an integer number (10801350).

Almost surely, 2^280780280 is an apocalyptic number.

280780280 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 280780280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (345643200).

280780280 is an abundant number, since it is smaller than the sum of its proper divisors (410506120).

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

280780280 is a wasteful number, since it uses less digits than its factorization.

280780280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1964 (or 1960 counting only the distinct ones).

The product of its (nonzero) digits is 14336, while the sum is 35.

The square root of 280780280 is about 16756.4996344702. The cubic root of 280780280 is about 654.8204002273.

The spelling of 280780280 in words is "two hundred eighty million, seven hundred eighty thousand, two hundred eighty".