320643401620 has 24 divisors (see below), whose sum is σ = 677640010824. Its totient is φ = 127440433536.

The previous prime is 320643401567. The next prime is 320643401653. The reversal of 320643401620 is 26104346023.

It can be written as a sum of positive squares in 4 ways, for example, as 4963484304 + 315679917316 = 70452^2 + 561854^2 .

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 51054727 + ... + 51061006.

It is an arithmetic number, because the mean of its divisors is an integer number (28235000451).

Almost surely, 2^320643401620 is an apocalyptic number.

It is an amenable number.

320643401620 is an abundant number, since it is smaller than the sum of its proper divisors (356996609204).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

320643401620 is a wasteful number, since it uses less digits than its factorization.

320643401620 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 102115899 (or 102115897 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 31.

Adding to 320643401620 its reverse (26104346023), we get a palindrome (346747747643).

The spelling of 320643401620 in words is "three hundred twenty billion, six hundred forty-three million, four hundred one thousand, six hundred twenty".