6342640000 has 80 divisors (see below), whose sum is σ = 15789805020. Its totient is φ = 2537024000.

The previous prime is 6342639929. The next prime is 6342640013. The reversal of 6342640000 is 462436.

It is a tau number, because it is divible by the number of its divisors (80).

It is a Harshad number since it is a multiple of its sum of digits (25).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 40359 + ... + 119641.

Almost surely, 2^6342640000 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 6342640000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (7894902510).

6342640000 is an abundant number, since it is smaller than the sum of its proper divisors (9447165020).

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

6342640000 is an frugal number, since it uses more digits than its factorization.

6342640000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 79317 (or 79290 counting only the distinct ones).

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

The square root of 6342640000 is about 79640.6931160195. The cubic root of 6342640000 is about 1851.0721810219.

The spelling of 6342640000 in words is "six billion, three hundred forty-two million, six hundred forty thousand".