321497668 has 6 divisors (see below), whose sum is σ = 562620926. Its totient is φ = 160748832.

The previous prime is 321497653. The next prime is 321497669. The reversal of 321497668 is 866794123.

It can be written as a sum of positive squares in only one way, i.e., 320481604 + 1016064 = 17902^2 + 1008^2 .

It is not an unprimeable number, because it can be changed into a prime (321497669) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40187205 + ... + 40187212.

Almost surely, 2^321497668 is an apocalyptic number.

It is an amenable number.

321497668 is a deficient number, since it is larger than the sum of its proper divisors (241123258).

321497668 is a wasteful number, since it uses less digits than its factorization.

321497668 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 80374421 (or 80374419 counting only the distinct ones).

The product of its digits is 435456, while the sum is 46.

The square root of 321497668 is about 17930.3560477755. The cubic root of 321497668 is about 685.0557917156.

The spelling of 321497668 in words is "three hundred twenty-one million, four hundred ninety-seven thousand, six hundred sixty-eight".