320642465 has 16 divisors (see below), whose sum is σ = 452039616. Its totient is φ = 215256000.

The previous prime is 320642459. The next prime is 320642467. The reversal of 320642465 is 564246023.

It is not a de Polignac number, because 320642465 - 2¹² = 320638369 is a prime.

It is a super-2 number, since 2×320642465² = 205623180722552450, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (320642467) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 223511 + ... + 224940.

It is an arithmetic number, because the mean of its divisors is an integer number (28252476).

Almost surely, 2^320642465 is an apocalyptic number.

It is an amenable number.

320642465 is a deficient number, since it is larger than the sum of its proper divisors (131397151).

320642465 is a wasteful number, since it uses less digits than its factorization.

320642465 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 448480.

The product of its (nonzero) digits is 34560, while the sum is 32.

The square root of 320642465 is about 17906.4922583961. The cubic root of 320642465 is about 684.4478225435.

Adding to 320642465 its reverse (564246023), we get a palindrome (884888488).

The spelling of 320642465 in words is "three hundred twenty million, six hundred forty-two thousand, four hundred sixty-five".