280867728 has 40 divisors (see below), whose sum is σ = 763765600. Its totient is φ = 88694784.

The previous prime is 280867721. The next prime is 280867757. The reversal of 280867728 is 827768082.

It is a Harshad number since it is a multiple of its sum of digits (48).

It is not an unprimeable number, because it can be changed into a prime (280867721) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 153073 + ... + 154896.

It is an arithmetic number, because the mean of its divisors is an integer number (19094140).

Almost surely, 2^280867728 is an apocalyptic number.

It is an amenable number.

280867728 is an abundant number, since it is smaller than the sum of its proper divisors (482897872).

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

280867728 is a wasteful number, since it uses less digits than its factorization.

280867728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 307999 (or 307993 counting only the distinct ones).

The product of its (nonzero) digits is 602112, while the sum is 48.

The square root of 280867728 is about 16759.1088068549. The cubic root of 280867728 is about 654.8883736508. Note that the first 3 decimals are identical.

The spelling of 280867728 in words is "two hundred eighty million, eight hundred sixty-seven thousand, seven hundred twenty-eight".