6921877836 has 24 divisors (see below), whose sum is σ = 16234737904. Its totient is φ = 2295336960.

The previous prime is 6921877819. The next prime is 6921877871. The reversal of 6921877836 is 6387781296.

It is a Smith number, since the sum of its digits (57) coincides with the sum of the digits of its prime factors.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1492045 + ... + 1496676.

Almost surely, 2^6921877836 is an apocalyptic number.

It is an amenable number.

6921877836 is an abundant number, since it is smaller than the sum of its proper divisors (9312860068).

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

6921877836 is a wasteful number, since it uses less digits than its factorization.

6921877836 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2988921 (or 2988919 counting only the distinct ones).

The product of its digits is 6096384, while the sum is 57.

The square root of 6921877836 is about 83197.8235051855. The cubic root of 6921877836 is about 1905.7882429052.

The spelling of 6921877836 in words is "six billion, nine hundred twenty-one million, eight hundred seventy-seven thousand, eight hundred thirty-six".