11439691648 has 128 divisors (see below), whose sum is σ = 28490019840. Its totient is φ = 4445030400.

The previous prime is 11439691643. The next prime is 11439691691. The reversal of 11439691648 is 84619693411.

It is a tau number, because it is divible by the number of its divisors (128).

It is a junction number, because it is equal to n+sod(n) for n = 11439691595 and 11439691604.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11439691643) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4246590 + ... + 4249282.

It is an arithmetic number, because the mean of its divisors is an integer number (222578280).

Almost surely, 2^11439691648 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 11439691648, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (14245009920).

11439691648 is an abundant number, since it is smaller than the sum of its proper divisors (17050328192).

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

11439691648 is a wasteful number, since it uses less digits than its factorization.

11439691648 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3156 (or 3144 counting only the distinct ones).

The product of its digits is 1119744, while the sum is 52.

The spelling of 11439691648 in words is "eleven billion, four hundred thirty-nine million, six hundred ninety-one thousand, six hundred forty-eight".