11644839840 has 96 divisors (see below), whose sum is σ = 37006030656. Its totient is φ = 3077795840.

The previous prime is 11644839839. The next prime is 11644839863. The reversal of 11644839840 is 4893844611.

It is a tau number, because it is divible by the number of its divisors (96).

It is a Harshad number since it is a multiple of its sum of digits (48).

It is a self number, because there is not a number n which added to its sum of digits gives 11644839840.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 53106 + ... + 161585.

It is an arithmetic number, because the mean of its divisors is an integer number (385479486).

Almost surely, 2^11644839840 is an apocalyptic number.

11644839840 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

11644839840 is an abundant number, since it is smaller than the sum of its proper divisors (25361190816).

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

11644839840 is a wasteful number, since it uses less digits than its factorization.

11644839840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 214822 (or 214814 counting only the distinct ones).

The product of its (nonzero) digits is 663552, while the sum is 48.

The spelling of 11644839840 in words is "eleven billion, six hundred forty-four million, eight hundred thirty-nine thousand, eight hundred forty".