320170387640 has 64 divisors (see below), whose sum is σ = 741502512000. Its totient is φ = 124329074688.

The previous prime is 320170387639. The next prime is 320170387657. The reversal of 320170387640 is 46783071023.

It is a congruent number.

It is an unprimeable number.

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 in 15 ways as a sum of consecutive naturals, for example, 423617 + ... + 905423.

It is an arithmetic number, because the mean of its divisors is an integer number (11585976750).

Almost surely, 2^320170387640 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 320170387640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (370751256000).

320170387640 is an abundant number, since it is smaller than the sum of its proper divisors (421332124360).

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

320170387640 is a wasteful number, since it uses less digits than its factorization.

320170387640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 482304 (or 482300 counting only the distinct ones).

The product of its (nonzero) digits is 169344, while the sum is 41.

The spelling of 320170387640 in words is "three hundred twenty billion, one hundred seventy million, three hundred eighty-seven thousand, six hundred forty".