280425287 has 4 divisors (see below), whose sum is σ = 289471296. Its totient is φ = 271379280.

The previous prime is 280425263. The next prime is 280425307. The reversal of 280425287 is 782524082.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 280425287 - 2⁸ = 280425031 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 280425287.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (280425227) 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, 4522958 + ... + 4523019.

It is an arithmetic number, because the mean of its divisors is an integer number (72367824).

Almost surely, 2^280425287 is an apocalyptic number.

280425287 is a deficient number, since it is larger than the sum of its proper divisors (9046009).

280425287 is an equidigital number, since it uses as much as digits as its factorization.

280425287 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9046008.

The product of its (nonzero) digits is 71680, while the sum is 38.

The square root of 280425287 is about 16745.9035886392. The cubic root of 280425287 is about 654.5443187626.

The spelling of 280425287 in words is "two hundred eighty million, four hundred twenty-five thousand, two hundred eighty-seven".