280490687 has 4 divisors (see below), whose sum is σ = 280623120. Its totient is φ = 280358256.

The previous prime is 280490671. The next prime is 280490731. The reversal of 280490687 is 786094082.

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 280490687 - 2⁴ = 280490671 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (280490087) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 62987 + ... + 67292.

It is an arithmetic number, because the mean of its divisors is an integer number (70155780).

Almost surely, 2^280490687 is an apocalyptic number.

280490687 is a deficient number, since it is larger than the sum of its proper divisors (132433).

280490687 is a wasteful number, since it uses less digits than its factorization.

280490687 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 132432.

The product of its (nonzero) digits is 193536, while the sum is 44.

The square root of 280490687 is about 16747.8561911667. The cubic root of 280490687 is about 654.5951984718.

The spelling of 280490687 in words is "two hundred eighty million, four hundred ninety thousand, six hundred eighty-seven".