321099648 has 64 divisors (see below), whose sum is σ = 854841600. Its totient is φ = 106792448.

The previous prime is 321099637. The next prime is 321099671. The reversal of 321099648 is 846990123.

It is a tau number, because it is divible by the number of its divisors (64).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 275515 + ... + 276677.

It is an arithmetic number, because the mean of its divisors is an integer number (13356900).

Almost surely, 2^321099648 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 321099648, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (427420800).

321099648 is an abundant number, since it is smaller than the sum of its proper divisors (533741952).

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

321099648 is a wasteful number, since it uses less digits than its factorization.

321099648 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1899 (or 1887 counting only the distinct ones).

The product of its (nonzero) digits is 93312, while the sum is 42.

The square root of 321099648 is about 17919.2535558823. The cubic root of 321099648 is about 684.7729710996.

The spelling of 321099648 in words is "three hundred twenty-one million, ninety-nine thousand, six hundred forty-eight".