320987563 has 8 divisors (see below), whose sum is σ = 360708768. Its totient is φ = 283413504.

The previous prime is 320987531. The next prime is 320987567. The reversal of 320987563 is 365789023.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 320987563 - 2⁵ = 320987531 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (320987567) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 536470 + ... + 537067.

It is an arithmetic number, because the mean of its divisors is an integer number (45088596).

Almost surely, 2^320987563 is an apocalyptic number.

320987563 is a deficient number, since it is larger than the sum of its proper divisors (39721205).

320987563 is a wasteful number, since it uses less digits than its factorization.

320987563 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1073573.

The product of its (nonzero) digits is 272160, while the sum is 43.

The square root of 320987563 is about 17916.1257809829. The cubic root of 320987563 is about 684.6932848181.

The spelling of 320987563 in words is "three hundred twenty million, nine hundred eighty-seven thousand, five hundred sixty-three".