321010640 has 20 divisors (see below), whose sum is σ = 746349924. Its totient is φ = 128404224.

The previous prime is 321010637. The next prime is 321010693. The reversal of 321010640 is 46010123.

It can be written as a sum of positive squares in 2 ways, for example, as 136702864 + 184307776 = 11692^2 + 13576^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2006237 + ... + 2006396.

Almost surely, 2^321010640 is an apocalyptic number.

It is an amenable number.

321010640 is an abundant number, since it is smaller than the sum of its proper divisors (425339284).

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

321010640 is a wasteful number, since it uses less digits than its factorization.

321010640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4012646 (or 4012640 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 17.

The square root of 321010640 is about 17916.7697981528. The cubic root of 321010640 is about 684.7096928145.

Adding to 321010640 its reverse (46010123), we get a palindrome (367020763).

The spelling of 321010640 in words is "three hundred twenty-one million, ten thousand, six hundred forty".