6659778 has 32 divisors (see below), whose sum is σ = 13844160. Its totient is φ = 2134080.

The previous prime is 6659777. The next prime is 6659803. The reversal of 6659778 is 8779566.

It is not an unprimeable number, because it can be changed into a prime (6659773) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 28968 + ... + 29196.

It is an arithmetic number, because the mean of its divisors is an integer number (432630).

Almost surely, 2^6659778 is an apocalyptic number.

6659778 is an abundant number, since it is smaller than the sum of its proper divisors (7184382).

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

6659778 is a wasteful number, since it uses less digits than its factorization.

6659778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 402.

The product of its digits is 635040, while the sum is 48.

The square root of 6659778 is about 2580.6545681280. The cubic root of 6659778 is about 188.1423586003.

The spelling of 6659778 in words is "six million, six hundred fifty-nine thousand, seven hundred seventy-eight".