6426645240 has 128 divisors (see below), whose sum is σ = 19701864000. Its totient is φ = 1676574720.

The previous prime is 6426645191. The next prime is 6426645259. The reversal of 6426645240 is 425466246.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1410486 + ... + 1415034.

Almost surely, 2^6426645240 is an apocalyptic number.

6426645240 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 6426645240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (9850932000).

6426645240 is an abundant number, since it is smaller than the sum of its proper divisors (13275218760).

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

6426645240 is a wasteful number, since it uses less digits than its factorization.

6426645240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4817 (or 4813 counting only the distinct ones).

The product of its (nonzero) digits is 276480, while the sum is 39.

The square root of 6426645240 is about 80166.3597776524. The cubic root of 6426645240 is about 1859.2085544824.

The spelling of 6426645240 in words is "six billion, four hundred twenty-six million, six hundred forty-five thousand, two hundred forty".