280134820 has 24 divisors (see below), whose sum is σ = 672323904. Its totient is φ = 96046176.

The previous prime is 280134791. The next prime is 280134847. The reversal of 280134820 is 28431082.

280134820 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (28).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1000342 + ... + 1000621.

It is an arithmetic number, because the mean of its divisors is an integer number (28013496).

Almost surely, 2^280134820 is an apocalyptic number.

280134820 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

280134820 is an abundant number, since it is smaller than the sum of its proper divisors (392189084).

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

280134820 is a wasteful number, since it uses less digits than its factorization.

280134820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2000979 (or 2000977 counting only the distinct ones).

The product of its (nonzero) digits is 3072, while the sum is 28.

The square root of 280134820 is about 16737.2285638931. The cubic root of 280134820 is about 654.3182464181.

The spelling of 280134820 in words is "two hundred eighty million, one hundred thirty-four thousand, eight hundred twenty".