280875540 has 96 divisors (see below), whose sum is σ = 895297536. Its totient is φ = 65127040.

The previous prime is 280875509. The next prime is 280875571. The reversal of 280875540 is 45578082.

It is an interprime number because it is at equal distance from previous prime (280875509) and next prime (280875571).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 5929 + ... + 24431.

It is an arithmetic number, because the mean of its divisors is an integer number (9326016).

Almost surely, 2^280875540 is an apocalyptic number.

280875540 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 280875540, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (447648768).

280875540 is an abundant number, since it is smaller than the sum of its proper divisors (614421996).

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

280875540 is a wasteful number, since it uses less digits than its factorization.

280875540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18549 (or 18547 counting only the distinct ones).

The product of its (nonzero) digits is 89600, while the sum is 39.

The square root of 280875540 is about 16759.3418725199. The cubic root of 280875540 is about 654.8944452402.

The spelling of 280875540 in words is "two hundred eighty million, eight hundred seventy-five thousand, five hundred forty".