6656778 has 12 divisors (see below), whose sum is σ = 14423058. Its totient is φ = 2218920.

The previous prime is 6656759. The next prime is 6656779. The reversal of 6656778 is 8776566.

It can be written as a sum of positive squares in only one way, i.e., 6335289 + 321489 = 2517^2 + 567^2 .

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (6656779) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 184893 + ... + 184928.

Almost surely, 2^6656778 is an apocalyptic number.

6656778 is an abundant number, since it is smaller than the sum of its proper divisors (7766280).

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

6656778 is a wasteful number, since it uses less digits than its factorization.

6656778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 369829 (or 369826 counting only the distinct ones).

The product of its digits is 423360, while the sum is 45.

The square root of 6656778 is about 2580.0732547740. The cubic root of 6656778 is about 188.1141038122.

The spelling of 6656778 in words is "six million, six hundred fifty-six thousand, seven hundred seventy-eight".