320669845 has 8 divisors (see below), whose sum is σ = 386485560. Its totient is φ = 255414720.

The previous prime is 320669809. The next prime is 320669857. The reversal of 320669845 is 548966023.

It can be written as a sum of positive squares in 4 ways, for example, as 125955729 + 194714116 = 11223^2 + 13954^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 320669845 - 2¹⁹ = 320145557 is a prime.

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, 138886 + ... + 141175.

It is an arithmetic number, because the mean of its divisors is an integer number (48310695).

Almost surely, 2^320669845 is an apocalyptic number.

It is an amenable number.

320669845 is a deficient number, since it is larger than the sum of its proper divisors (65815715).

320669845 is a wasteful number, since it uses less digits than its factorization.

320669845 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 280295.

The product of its (nonzero) digits is 311040, while the sum is 43.

The square root of 320669845 is about 17907.2567692542. The cubic root of 320669845 is about 684.4673038974.

The spelling of 320669845 in words is "three hundred twenty million, six hundred sixty-nine thousand, eight hundred forty-five".