6464320 has 28 divisors (see below), whose sum is σ = 15393924. Its totient is φ = 2585600.

The previous prime is 6464317. The next prime is 6464323. The reversal of 6464320 is 234646.

It is an interprime number because it is at equal distance from previous prime (6464317) and next prime (6464323).

It can be written as a sum of positive squares in 2 ways, for example, as 665856 + 5798464 = 816^2 + 2408^2 .

It is an Ulam number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6464323) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9781 + ... + 10420.

It is an arithmetic number, because the mean of its divisors is an integer number (549783).

Almost surely, 2^6464320 is an apocalyptic number.

It is an amenable number.

6464320 is an abundant number, since it is smaller than the sum of its proper divisors (8929604).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

6464320 is a wasteful number, since it uses less digits than its factorization.

6464320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20218 (or 20208 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 25.

The square root of 6464320 is about 2542.5027040300. The cubic root of 6464320 is about 186.2834541951.

Adding to 6464320 its reverse (234646), we get a palindrome (6698966).

The spelling of 6464320 in words is "six million, four hundred sixty-four thousand, three hundred twenty".