280555279 has 4 divisors (see below), whose sum is σ = 284398576. Its totient is φ = 276711984.

The previous prime is 280555271. The next prime is 280555321. The reversal of 280555279 is 972555082.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 972555082 = 2 ⋅486277541.

It is a cyclic number.

It is not a de Polignac number, because 280555279 - 2³ = 280555271 is a prime.

It is a super-2 number, since 2×280555279² = 157422529149535682, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (280555271) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1921539 + ... + 1921684.

It is an arithmetic number, because the mean of its divisors is an integer number (71099644).

Almost surely, 2^280555279 is an apocalyptic number.

280555279 is a deficient number, since it is larger than the sum of its proper divisors (3843297).

280555279 is an equidigital number, since it uses as much as digits as its factorization.

280555279 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3843296.

The product of its (nonzero) digits is 252000, while the sum is 43.

The square root of 280555279 is about 16749.7844463742. The cubic root of 280555279 is about 654.6454418130.

The spelling of 280555279 in words is "two hundred eighty million, five hundred fifty-five thousand, two hundred seventy-nine".