280528920 has 576 divisors, whose sum is σ = 1195084800. Its totient is φ = 58786560.

The previous prime is 280528909. The next prime is 280528957. The reversal of 280528920 is 29825082.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 143 ways as a sum of consecutive naturals, for example, 9049305 + ... + 9049335.

It is an arithmetic number, because the mean of its divisors is an integer number (2074800).

Almost surely, 2^280528920 is an apocalyptic number.

280528920 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 280528920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (597542400).

280528920 is an abundant number, since it is smaller than the sum of its proper divisors (914555880).

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

280528920 is a wasteful number, since it uses less digits than its factorization.

280528920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 90 (or 67 counting only the distinct ones).

The product of its (nonzero) digits is 23040, while the sum is 36.

The square root of 280528920 is about 16748.9975819450. The cubic root of 280528920 is about 654.6249392110.

The spelling of 280528920 in words is "two hundred eighty million, five hundred twenty-eight thousand, nine hundred twenty".