19871228735 has 4 divisors (see below), whose sum is σ = 23845474488. Its totient is φ = 15896982984.

The previous prime is 19871228711. The next prime is 19871228743. The reversal of 19871228735 is 53782217891.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 19871228735 - 2⁸ = 19871228479 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1987122869 + ... + 1987122878.

It is an arithmetic number, because the mean of its divisors is an integer number (5961368622).

Almost surely, 2^19871228735 is an apocalyptic number.

19871228735 is a deficient number, since it is larger than the sum of its proper divisors (3974245753).

19871228735 is an equidigital number, since it uses as much as digits as its factorization.

19871228735 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3974245752.

The product of its digits is 1693440, while the sum is 53.

The spelling of 19871228735 in words is "nineteen billion, eight hundred seventy-one million, two hundred twenty-eight thousand, seven hundred thirty-five".