6306640 has 40 divisors (see below), whose sum is σ = 15141888. Its totient is φ = 2440320.

The previous prime is 6306617. The next prime is 6306647. The reversal of 6306640 is 466036.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (40).

It is a hoax number, since the sum of its digits (25) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6306647) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1209 + ... + 3751.

Almost surely, 2^6306640 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 6306640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (7570944).

6306640 is an abundant number, since it is smaller than the sum of its proper divisors (8835248).

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

6306640 is a wasteful number, since it uses less digits than its factorization.

6306640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2587 (or 2581 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 25.

The square root of 6306640 is about 2511.3024509206. The cubic root of 6306640 is about 184.7563385792.

The spelling of 6306640 in words is "six million, three hundred six thousand, six hundred forty".