6403136564 has 36 divisors (see below), whose sum is σ = 13041310212. Its totient is φ = 2739306240.

The previous prime is 6403136561. The next prime is 6403136569. The reversal of 6403136564 is 4656313046.

It can be written as a sum of positive squares in 2 ways, for example, as 5966326564 + 436810000 = 77242^2 + 20900^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6403136561) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 380879 + ... + 397334.

It is an arithmetic number, because the mean of its divisors is an integer number (362258617).

Almost surely, 2^6403136564 is an apocalyptic number.

It is an amenable number.

6403136564 is an abundant number, since it is smaller than the sum of its proper divisors (6638173648).

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

6403136564 is a wasteful number, since it uses less digits than its factorization.

6403136564 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 778256 (or 778243 counting only the distinct ones).

The product of its (nonzero) digits is 155520, while the sum is 38.

The square root of 6403136564 is about 80019.6011237247. The cubic root of 6403136564 is about 1856.9387889190.

The spelling of 6403136564 in words is "six billion, four hundred three million, one hundred thirty-six thousand, five hundred sixty-four".