320636887 has 4 divisors (see below), whose sum is σ = 321661600. Its totient is φ = 319612176.

The previous prime is 320636863. The next prime is 320636891. The reversal of 320636887 is 788636023.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-320636887 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 (320636287) 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, 511887 + ... + 512512.

It is an arithmetic number, because the mean of its divisors is an integer number (80415400).

Almost surely, 2^320636887 is an apocalyptic number.

320636887 is a deficient number, since it is larger than the sum of its proper divisors (1024713).

320636887 is a wasteful number, since it uses less digits than its factorization.

320636887 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1024712.

The product of its (nonzero) digits is 290304, while the sum is 43.

The square root of 320636887 is about 17906.3365041541. The cubic root of 320636887 is about 684.4438535620.

The spelling of 320636887 in words is "three hundred twenty million, six hundred thirty-six thousand, eight hundred eighty-seven".