280428516 has 27 divisors (see below), whose sum is σ = 709115043. Its totient is φ = 93442680.

The previous prime is 280428509. The next prime is 280428517. The reversal of 280428516 is 615824082.

The square root of 280428516 is 16746.

It is a perfect power (a square), and thus also a powerful number.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (280428517) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 99081 + ... + 101871.

Almost surely, 2^280428516 is an apocalyptic number.

280428516 is the 16746-th square number.

It is an amenable number.

280428516 is an abundant number, since it is smaller than the sum of its proper divisors (428686527).

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

280428516 is an equidigital number, since it uses as much as digits as its factorization.

280428516 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5592 (or 2796 counting only the distinct ones).

The product of its (nonzero) digits is 30720, while the sum is 36.

The cubic root of 280428516 is about 654.5468310367.

Multiplying 280428516 by its sum of digits (36), we get a square (10095426576 = 100476²).

280428516 divided by its sum of digits (36) gives a square (7789681 = 2791²).

The spelling of 280428516 in words is "two hundred eighty million, four hundred twenty-eight thousand, five hundred sixteen".