280427868 has 72 divisors (see below), whose sum is σ = 845365248. Its totient is φ = 76637088.

The previous prime is 280427857. The next prime is 280427879. The reversal of 280427868 is 868724082.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (280427857) and next prime (280427879).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 18396 + ... + 29987.

It is an arithmetic number, because the mean of its divisors is an integer number (11741184).

Almost surely, 2^280427868 is an apocalyptic number.

280427868 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

280427868 is an abundant number, since it is smaller than the sum of its proper divisors (564937380).

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

280427868 is a wasteful number, since it uses less digits than its factorization.

280427868 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48423 (or 48418 counting only the distinct ones).

The product of its (nonzero) digits is 344064, while the sum is 45.

The square root of 280427868 is about 16745.9806520848. The cubic root of 280427868 is about 654.5463268717.

The spelling of 280427868 in words is "two hundred eighty million, four hundred twenty-seven thousand, eight hundred sixty-eight".