6465440 has 48 divisors (see below), whose sum is σ = 16179912. Its totient is φ = 2433024.

The previous prime is 6465419. The next prime is 6465467. The reversal of 6465440 is 445646.

It can be written as a sum of positive squares in 4 ways, for example, as 5626384 + 839056 = 2372^2 + 916^2 .

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, 1532 + ... + 3908.

Almost surely, 2^6465440 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 6465440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (8089956).

6465440 is an abundant number, since it is smaller than the sum of its proper divisors (9714472).

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

6465440 is a wasteful number, since it uses less digits than its factorization.

6465440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2409 (or 2401 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 29.

The square root of 6465440 is about 2542.7229499102. The cubic root of 6465440 is about 186.2942119866.

The spelling of 6465440 in words is "six million, four hundred sixty-five thousand, four hundred forty".