6446243636 has 12 divisors (see below), whose sum is σ = 12892487328. Its totient is φ = 2762675832.

The previous prime is 6446243621. The next prime is 6446243647. The reversal of 6446243636 is 6363426446.

6446243636 is an admirable number.

It is a hoax number, since the sum of its digits (44) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 115111466 + ... + 115111521.

It is an arithmetic number, because the mean of its divisors is an integer number (1074373944).

Almost surely, 2^6446243636 is an apocalyptic number.

It is an amenable number.

6446243636 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

6446243636 is a wasteful number, since it uses less digits than its factorization.

6446243636 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 230222998 (or 230222996 counting only the distinct ones).

The product of its digits is 1492992, while the sum is 44.

The square root of 6446243636 is about 80288.5025143700. The cubic root of 6446243636 is about 1861.0965550069.

The spelling of 6446243636 in words is "six billion, four hundred forty-six million, two hundred forty-three thousand, six hundred thirty-six".