11687215820 has 24 divisors (see below), whose sum is σ = 28049318304. Its totient is φ = 4007045376.

The previous prime is 11687215801. The next prime is 11687215823. The reversal of 11687215820 is 2851278611.

It is not an unprimeable number, because it can be changed into a prime (11687215823) 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, 41739917 + ... + 41740196.

It is an arithmetic number, because the mean of its divisors is an integer number (1168721596).

Almost surely, 2^11687215820 is an apocalyptic number.

11687215820 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

11687215820 is an abundant number, since it is smaller than the sum of its proper divisors (16362102484).

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

11687215820 is a wasteful number, since it uses less digits than its factorization.

11687215820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 83480129 (or 83480127 counting only the distinct ones).

The product of its (nonzero) digits is 53760, while the sum is 41.

The spelling of 11687215820 in words is "eleven billion, six hundred eighty-seven million, two hundred fifteen thousand, eight hundred twenty".