6340640 has 48 divisors (see below), whose sum is σ = 15640128. Its totient is φ = 2424576.

The previous prime is 6340637. The next prime is 6340657. The reversal of 6340640 is 460436.

It is a Harshad number since it is a multiple of its sum of digits (23).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (5) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2819 + ... + 4541.

It is an arithmetic number, because the mean of its divisors is an integer number (325836).

Almost surely, 2^6340640 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 6340640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (7820064).

6340640 is an abundant number, since it is smaller than the sum of its proper divisors (9299488).

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

6340640 is a wasteful number, since it uses less digits than its factorization.

6340640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1761 (or 1753 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 23.

The square root of 6340640 is about 2518.0627474310. The cubic root of 6340640 is about 185.0877596771.

The spelling of 6340640 in words is "six million, three hundred forty thousand, six hundred forty".