6894978920 has 16 divisors (see below), whose sum is σ = 15513702660. Its totient is φ = 2757991552.

The previous prime is 6894978919. The next prime is 6894978947. The reversal of 6894978920 is 298794986.

It can be written as a sum of positive squares in 2 ways, for example, as 6155030116 + 739948804 = 78454^2 + 27202^2 .

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 3 ways as a sum of consecutive naturals, for example, 86187197 + ... + 86187276.

Almost surely, 2^6894978920 is an apocalyptic number.

It is an amenable number.

6894978920 is an abundant number, since it is smaller than the sum of its proper divisors (8618723740).

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

6894978920 is a wasteful number, since it uses less digits than its factorization.

6894978920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 172374484 (or 172374480 counting only the distinct ones).

The product of its (nonzero) digits is 15676416, while the sum is 62.

The square root of 6894978920 is about 83036.0097788905. The cubic root of 6894978920 is about 1903.3163613560.

The spelling of 6894978920 in words is "six billion, eight hundred ninety-four million, nine hundred seventy-eight thousand, nine hundred twenty".