280811132 has 48 divisors (see below), whose sum is σ = 577839360. Its totient is φ = 116899200.

The previous prime is 280811131. The next prime is 280811213. The reversal of 280811132 is 231118082.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (280811131) 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, 379619 + ... + 380357.

It is an arithmetic number, because the mean of its divisors is an integer number (12038320).

Almost surely, 2^280811132 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 280811132, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (288919680).

280811132 is an abundant number, since it is smaller than the sum of its proper divisors (297028228).

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

280811132 is a wasteful number, since it uses less digits than its factorization.

280811132 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1122 (or 1120 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 26.

The square root of 280811132 is about 16757.4202071799. The cubic root of 280811132 is about 654.8443831308.

The spelling of 280811132 in words is "two hundred eighty million, eight hundred eleven thousand, one hundred thirty-two".