321632768 has 20 divisors (see below), whose sum is σ = 642638370. Its totient is φ = 160816128.

The previous prime is 321632747. The next prime is 321632789. The reversal of 321632768 is 867236123.

It is an interprime number because it is at equal distance from previous prime (321632747) and next prime (321632789).

It can be written as a sum of positive squares in only one way, i.e., 286015744 + 35617024 = 16912^2 + 5968^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 313583 + ... + 314606.

Almost surely, 2^321632768 is an apocalyptic number.

It is an amenable number.

321632768 is a deficient number, since it is larger than the sum of its proper divisors (321005602).

321632768 is an frugal number, since it uses more digits than its factorization.

321632768 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 628207 (or 628191 counting only the distinct ones).

The product of its digits is 72576, while the sum is 38.

The square root of 321632768 is about 17934.1230061578. The cubic root of 321632768 is about 685.1517365033.

The spelling of 321632768 in words is "three hundred twenty-one million, six hundred thirty-two thousand, seven hundred sixty-eight".