6699978 has 24 divisors (see below), whose sum is σ = 14566500. Its totient is φ = 2225664.

The previous prime is 6699977. The next prime is 6700007. The reversal of 6699978 is 8799966.

It can be written as a sum of positive squares in 2 ways, for example, as 6640929 + 59049 = 2577^2 + 243^2 .

It is not an unprimeable number, because it can be changed into a prime (6699977) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 7668 + ... + 8496.

Almost surely, 2^6699978 is an apocalyptic number.

6699978 is an abundant number, since it is smaller than the sum of its proper divisors (7866522).

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

6699978 is a wasteful number, since it uses less digits than its factorization.

6699978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1286 (or 1283 counting only the distinct ones).

The product of its digits is 1469664, while the sum is 54.

The square root of 6699978 is about 2588.4315714347. The cubic root of 6699978 is about 188.5201567612.

The spelling of 6699978 in words is "six million, six hundred ninety-nine thousand, nine hundred seventy-eight".