6699778 has 8 divisors (see below), whose sum is σ = 10060668. Its totient is φ = 3346224.

The previous prime is 6699767. The next prime is 6699779. The reversal of 6699778 is 8779966.

It can be written as a sum of positive squares in 2 ways, for example, as 6671889 + 27889 = 2583^2 + 167^2 .

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

It is not an unprimeable number, because it can be changed into a prime (6699779) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2500 + ... + 4432.

Almost surely, 2^6699778 is an apocalyptic number.

6699778 is a deficient number, since it is larger than the sum of its proper divisors (3360890).

6699778 is a wasteful number, since it uses less digits than its factorization.

6699778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3668.

The product of its digits is 1143072, while the sum is 52.

The square root of 6699778 is about 2588.3929377125. The cubic root of 6699778 is about 188.5182809139.

The spelling of 6699778 in words is "six million, six hundred ninety-nine thousand, seven hundred seventy-eight".