320002687 has 2 divisors, whose sum is σ = 320002688. Its totient is φ = 320002686.

The previous prime is 320002651. The next prime is 320002691. The reversal of 320002687 is 786200023.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-320002687 is a prime.

It is a super-4 number, since 4×320002687⁴ (a number of 35 digits) contains 4444 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (320002387) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 160001343 + 160001344.

It is an arithmetic number, because the mean of its divisors is an integer number (160001344).

Almost surely, 2^320002687 is an apocalyptic number.

320002687 is a deficient number, since it is larger than the sum of its proper divisors (1).

320002687 is an equidigital number, since it uses as much as digits as its factorization.

320002687 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4032, while the sum is 28.

The square root of 320002687 is about 17888.6189237739. The cubic root of 320002687 is about 683.9922931259.

The spelling of 320002687 in words is "three hundred twenty million, two thousand, six hundred eighty-seven".