280879140 has 48 divisors (see below), whose sum is σ = 787364928. Its totient is φ = 74815104.

The previous prime is 280879133. The next prime is 280879141. The reversal of 280879140 is 41978082.

It is not an unprimeable number, because it can be changed into a prime (280879141) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 63439 + ... + 67721.

It is an arithmetic number, because the mean of its divisors is an integer number (16403436).

Almost surely, 2^280879140 is an apocalyptic number.

280879140 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

280879140 is an abundant number, since it is smaller than the sum of its proper divisors (506485788).

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

280879140 is a wasteful number, since it uses less digits than its factorization.

280879140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5388 (or 5386 counting only the distinct ones).

The product of its (nonzero) digits is 32256, while the sum is 39.

The square root of 280879140 is about 16759.4492749613. The cubic root of 280879140 is about 654.8972431698.

The spelling of 280879140 in words is "two hundred eighty million, eight hundred seventy-nine thousand, one hundred forty".