8688021819 has 8 divisors (see below), whose sum is σ = 12265442640. Its totient is φ = 5451307776.

The previous prime is 8688021809. The next prime is 8688021827. The reversal of 8688021819 is 9181208868.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a de Polignac number, because none of the positive numbers 2^k-8688021819 is a prime.

It is a super-2 number, since 2×8688021819² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (51), and also a Moran number because the ratio is a prime number: 170353369 = 8688021819 / (8 + 6 + 8 + 8 + 0 + 2 + 1 + 8 + 1 + 9).

It is not an unprimeable number, because it can be changed into a prime (8688021809) 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, 85176634 + ... + 85176735.

It is an arithmetic number, because the mean of its divisors is an integer number (1533180330).

Almost surely, 2^8688021819 is an apocalyptic number.

8688021819 is a deficient number, since it is larger than the sum of its proper divisors (3577420821).

8688021819 is a wasteful number, since it uses less digits than its factorization.

8688021819 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 170353389.

The product of its (nonzero) digits is 442368, while the sum is 51.

The square root of 8688021819 is about 93209.5586246389. The cubic root of 8688021819 is about 2055.7657882048.

The spelling of 8688021819 in words is "eight billion, six hundred eighty-eight million, twenty-one thousand, eight hundred nineteen".