6402252640 has 96 divisors (see below), whose sum is σ = 17457539904. Its totient is φ = 2173286400.

The previous prime is 6402252631. The next prime is 6402252677. The reversal of 6402252640 is 462522046.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 84822 + ... + 141418.

It is an arithmetic number, because the mean of its divisors is an integer number (181849374).

Almost surely, 2^6402252640 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 6402252640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (8728769952).

6402252640 is an abundant number, since it is smaller than the sum of its proper divisors (11055287264).

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

6402252640 is a wasteful number, since it uses less digits than its factorization.

6402252640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 56720 (or 56712 counting only the distinct ones).

The product of its (nonzero) digits is 23040, while the sum is 31.

The square root of 6402252640 is about 80014.0777613540. The cubic root of 6402252640 is about 1856.8533376572.

Adding to 6402252640 its reverse (462522046), we get a palindrome (6864774686).

The spelling of 6402252640 in words is "six billion, four hundred two million, two hundred fifty-two thousand, six hundred forty".