11728643520 has 112 divisors (see below), whose sum is σ = 40623792768. Its totient is φ = 2843304960.

The previous prime is 11728643503. The next prime is 11728643599. The reversal of 11728643520 is 2534682711.

It is a super-2 number, since 2×11728643520² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

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, 544774 + ... + 565893.

Almost surely, 2^11728643520 is an apocalyptic number.

11728643520 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

11728643520 is an abundant number, since it is smaller than the sum of its proper divisors (28895149248).

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

11728643520 is a wasteful number, since it uses less digits than its factorization.

11728643520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1110698 (or 1110688 counting only the distinct ones).

The product of its (nonzero) digits is 80640, while the sum is 39.

The spelling of 11728643520 in words is "eleven billion, seven hundred twenty-eight million, six hundred forty-three thousand, five hundred twenty".