320321987 has 8 divisors (see below), whose sum is σ = 329368800. Its totient is φ = 311295744.

The previous prime is 320321951. The next prime is 320321999. The reversal of 320321987 is 789123023.

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 320321987 - 2⁶ = 320321923 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (320321917) 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, 29714 + ... + 39032.

It is an arithmetic number, because the mean of its divisors is an integer number (41171100).

Almost surely, 2^320321987 is an apocalyptic number.

320321987 is a gapful number since it is divisible by the number (37) formed by its first and last digit.

320321987 is a deficient number, since it is larger than the sum of its proper divisors (9046813).

320321987 is an equidigital number, since it uses as much as digits as its factorization.

320321987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10285.

The product of its (nonzero) digits is 18144, while the sum is 35.

The square root of 320321987 is about 17897.5413674616. The cubic root of 320321987 is about 684.2197142785.

The spelling of 320321987 in words is "three hundred twenty million, three hundred twenty-one thousand, nine hundred eighty-seven".