11538236787 has 64 divisors (see below), whose sum is σ = 21191860224. Its totient is φ = 5395991040.

The previous prime is 11538236779. The next prime is 11538236813. The reversal of 11538236787 is 78763283511.

It is not a de Polignac number, because 11538236787 - 2³ = 11538236779 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (51).

It is not an unprimeable number, because it can be changed into a prime (11538236707) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 26448 + ... + 154194.

It is an arithmetic number, because the mean of its divisors is an integer number (331122816).

Almost surely, 2^11538236787 is an apocalyptic number.

11538236787 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

11538236787 is a deficient number, since it is larger than the sum of its proper divisors (9653623437).

11538236787 is a wasteful number, since it uses less digits than its factorization.

11538236787 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 127808.

The product of its digits is 1693440, while the sum is 51.

The spelling of 11538236787 in words is "eleven billion, five hundred thirty-eight million, two hundred thirty-six thousand, seven hundred eighty-seven".