321600916 has 144 divisors (see below), whose sum is σ = 758352000. Its totient is φ = 118879488.

The previous prime is 321600911. The next prime is 321600919. The reversal of 321600916 is 619006123.

It is a Harshad number since it is a multiple of its sum of digits (28).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (321600911) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 4405456 + ... + 4405528.

Almost surely, 2^321600916 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 321600916, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (379176000).

321600916 is an abundant number, since it is smaller than the sum of its proper divisors (436751084).

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

321600916 is a wasteful number, since it uses less digits than its factorization.

321600916 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 143 (or 114 counting only the distinct ones).

The product of its (nonzero) digits is 1944, while the sum is 28.

The square root of 321600916 is about 17933.2349563597. The cubic root of 321600916 is about 685.1291183958.

The spelling of 321600916 in words is "three hundred twenty-one million, six hundred thousand, nine hundred sixteen".