320087881 has 3 divisors (see below), whose sum is σ = 320105773. Its totient is φ = 320069990.

The previous prime is 320087863. The next prime is 320087891. The reversal of 320087881 is 188780023.

The square root of 320087881 is 17891.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is not a de Polignac number, because 320087881 - 2²³ = 311699273 is a prime.

It is a super-2 number, since 2×320087881² = 204912503126140322, which contains 22 as substring.

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 320087881.

It is not an unprimeable number, because it can be changed into a prime (320087891) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 8946 + ... + 26836.

Almost surely, 2^320087881 is an apocalyptic number.

320087881 is the 17891-st square number.

320087881 is the 8946-th centered octagonal number.

It is an amenable number.

320087881 is a deficient number, since it is larger than the sum of its proper divisors (17892).

320087881 is an frugal number, since it uses more digits than its factorization.

320087881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35782 (or 17891 counting only the distinct ones).

The product of its (nonzero) digits is 21504, while the sum is 37.

The cubic root of 320087881 is about 684.0529872714.

The spelling of 320087881 in words is "three hundred twenty million, eighty-seven thousand, eight hundred eighty-one".