11861028840 has 128 divisors (see below), whose sum is σ = 36596736000. Its totient is φ = 3073593600.

The previous prime is 11861028821. The next prime is 11861028857. The reversal of 11861028840 is 4882016811.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1021065 + ... + 1032615.

It is an arithmetic number, because the mean of its divisors is an integer number (285912000).

Almost surely, 2^11861028840 is an apocalyptic number.

11861028840 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 11861028840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (18298368000).

11861028840 is an abundant number, since it is smaller than the sum of its proper divisors (24735707160).

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

11861028840 is a wasteful number, since it uses less digits than its factorization.

11861028840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11807 (or 11803 counting only the distinct ones).

The product of its (nonzero) digits is 24576, while the sum is 39.

The spelling of 11861028840 in words is "eleven billion, eight hundred sixty-one million, twenty-eight thousand, eight hundred forty".