280742928 has 40 divisors (see below), whose sum is σ = 725995200. Its totient is φ = 93485184.

The previous prime is 280742921. The next prime is 280742941. The reversal of 280742928 is 829247082.

It is a self number, because there is not a number n which added to its sum of digits gives 280742928.

It is not an unprimeable number, because it can be changed into a prime (280742921) 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, 56613 + ... + 61371.

It is an arithmetic number, because the mean of its divisors is an integer number (18149880).

Almost surely, 2^280742928 is an apocalyptic number.

It is an amenable number.

280742928 is an abundant number, since it is smaller than the sum of its proper divisors (445252272).

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

280742928 is a wasteful number, since it uses less digits than its factorization.

280742928 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5999 (or 5993 counting only the distinct ones).

The product of its (nonzero) digits is 129024, while the sum is 42.

The square root of 280742928 is about 16755.3850448147. The cubic root of 280742928 is about 654.7913621764.

The spelling of 280742928 in words is "two hundred eighty million, seven hundred forty-two thousand, nine hundred twenty-eight".