6436578645 has 48 divisors (see below), whose sum is σ = 13095189120. Its totient is φ = 2862905472.

The previous prime is 6436578613. The next prime is 6436578647. The reversal of 6436578645 is 5468756346.

6436578645 is a `hidden beast` number, since 6 + 4 + 3 + 6 + 578 + 64 + 5 = 666.

It is not a de Polignac number, because 6436578645 - 2⁵ = 6436578613 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 6436578591 and 6436578600.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6436578647) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 264475 + ... + 287784.

It is an arithmetic number, because the mean of its divisors is an integer number (272816440).

Almost surely, 2^6436578645 is an apocalyptic number.

It is an amenable number.

6436578645 is an abundant number, since it is smaller than the sum of its proper divisors (6658610475).

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

6436578645 is a wasteful number, since it uses less digits than its factorization.

6436578645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 552314 (or 552311 counting only the distinct ones).

The product of its digits is 14515200, while the sum is 54.

The square root of 6436578645 is about 80228.2908019359. The cubic root of 6436578645 is about 1860.1659624718.

The spelling of 6436578645 in words is "six billion, four hundred thirty-six million, five hundred seventy-eight thousand, six hundred forty-five".