328520639 has 2 divisors, whose sum is σ = 328520640. Its totient is φ = 328520638.

The previous prime is 328520629. The next prime is 328520641. The reversal of 328520639 is 936025823.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 328520639 - 2⁴ = 328520623 is a prime.

Together with 328520641, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (328520629) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 164260319 + 164260320.

It is an arithmetic number, because the mean of its divisors is an integer number (164260320).

Almost surely, 2^328520639 is an apocalyptic number.

328520639 is a deficient number, since it is larger than the sum of its proper divisors (1).

328520639 is an equidigital number, since it uses as much as digits as its factorization.

328520639 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 77760, while the sum is 38.

The square root of 328520639 is about 18125.1383167136. The cubic root of 328520639 is about 690.0081487520.

The spelling of 328520639 in words is "three hundred twenty-eight million, five hundred twenty thousand, six hundred thirty-nine".