321672345 has 16 divisors (see below), whose sum is σ = 515470272. Its totient is φ = 171293760.

The previous prime is 321672343. The next prime is 321672349. The reversal of 321672345 is 543276123.

It is not a de Polignac number, because 321672345 - 2¹ = 321672343 is a prime.

It is an alternating number because its digits alternate between odd and even.

It is not an unprimeable number, because it can be changed into a prime (321672343) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 6307 + ... + 26136.

It is an arithmetic number, because the mean of its divisors is an integer number (32216892).

Almost surely, 2^321672345 is an apocalyptic number.

It is an amenable number.

321672345 is a deficient number, since it is larger than the sum of its proper divisors (193797927).

321672345 is a wasteful number, since it uses less digits than its factorization.

321672345 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33112.

The product of its digits is 30240, while the sum is 33.

The square root of 321672345 is about 17935.2263715851. The cubic root of 321672345 is about 685.1798380535.

The spelling of 321672345 in words is "three hundred twenty-one million, six hundred seventy-two thousand, three hundred forty-five".