6436543644 has 36 divisors (see below), whose sum is σ = 16476110560. Its totient is φ = 2118355200.

The previous prime is 6436543567. The next prime is 6436543657. The reversal of 6436543644 is 4463456346.

6436543644 is a `hidden beast` number, since 6 + 43 + 6 + 543 + 64 + 4 = 666.

It is a tau number, because it is divible by the number of its divisors (36).

It is a super-2 number, since 2×6436543644² = 82858188162233597472, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 6436543644.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1128757 + ... + 1134444.

Almost surely, 2^6436543644 is an apocalyptic number.

It is an amenable number.

6436543644 is an abundant number, since it is smaller than the sum of its proper divisors (10039566916).

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

6436543644 is a wasteful number, since it uses less digits than its factorization.

6436543644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2263290 (or 2263285 counting only the distinct ones).

The product of its digits is 2488320, while the sum is 45.

The square root of 6436543644 is about 80228.0726678636. The cubic root of 6436543644 is about 1860.1625907122.

The spelling of 6436543644 in words is "six billion, four hundred thirty-six million, five hundred forty-three thousand, six hundred forty-four".