6440837836 has 24 divisors (see below), whose sum is σ = 11463230016. Its totient is φ = 3165827280.

The previous prime is 6440837827. The next prime is 6440837839. The reversal of 6440837836 is 6387380446.

It is a self number, because there is not a number n which added to its sum of digits gives 6440837836.

It is not an unprimeable number, because it can be changed into a prime (6440837839) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 107115 + ... + 156061.

It is an arithmetic number, because the mean of its divisors is an integer number (477634584).

Almost surely, 2^6440837836 is an apocalyptic number.

It is an amenable number.

6440837836 is a deficient number, since it is larger than the sum of its proper divisors (5022392180).

6440837836 is a wasteful number, since it uses less digits than its factorization.

6440837836 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49509 (or 49507 counting only the distinct ones).

The product of its (nonzero) digits is 2322432, while the sum is 49.

The square root of 6440837836 is about 80254.8306085061. The cubic root of 6440837836 is about 1860.5761729089.

The spelling of 6440837836 in words is "six billion, four hundred forty million, eight hundred thirty-seven thousand, eight hundred thirty-six".