280716380 has 48 divisors (see below), whose sum is σ = 703019520. Its totient is φ = 92059968.

The previous prime is 280716379. The next prime is 280716391. The reversal of 280716380 is 83617082.

It is a Harshad number since it is a multiple of its sum of digits (35).

It is a self number, because there is not a number n which added to its sum of digits gives 280716380.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 40370 + ... + 46809.

It is an arithmetic number, because the mean of its divisors is an integer number (14646240).

Almost surely, 2^280716380 is an apocalyptic number.

280716380 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

280716380 is an abundant number, since it is smaller than the sum of its proper divisors (422303140).

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

280716380 is a wasteful number, since it uses less digits than its factorization.

280716380 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 87218 (or 87216 counting only the distinct ones).

The product of its (nonzero) digits is 16128, while the sum is 35.

The square root of 280716380 is about 16754.5928031689. The cubic root of 280716380 is about 654.7707217644.

The spelling of 280716380 in words is "two hundred eighty million, seven hundred sixteen thousand, three hundred eighty".