280555379 has 12 divisors (see below), whose sum is σ = 304290936. Its totient is φ = 258553152.

The previous prime is 280555351. The next prime is 280555381. The reversal of 280555379 is 973555082.

It is not a de Polignac number, because 280555379 - 2²⁰ = 279506803 is a prime.

It is a super-2 number, since 2×280555379² = 157422641371667282, which contains 22 as substring.

It is a Smith number, since the sum of its digits (44) coincides with the sum of the digits of its prime factors.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (280555339) by changing a digit.

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 11 ways as a sum of consecutive naturals, for example, 159167 + ... + 160919.

It is an arithmetic number, because the mean of its divisors is an integer number (25357578).

Almost surely, 2^280555379 is an apocalyptic number.

280555379 is a deficient number, since it is larger than the sum of its proper divisors (23735557).

280555379 is a wasteful number, since it uses less digits than its factorization.

280555379 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2726 (or 2713 counting only the distinct ones).

The product of its (nonzero) digits is 378000, while the sum is 44.

The square root of 280555379 is about 16749.7874314870. The cubic root of 280555379 is about 654.6455195927.

The spelling of 280555379 in words is "two hundred eighty million, five hundred fifty-five thousand, three hundred seventy-nine".