6669578 has 4 divisors (see below), whose sum is σ = 10004370. Its totient is φ = 3334788.

The previous prime is 6669547. The next prime is 6669587. The reversal of 6669578 is 8759666.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 8759666 = 2 ⋅4379833.

It can be written as a sum of positive squares in only one way, i.e., 6589489 + 80089 = 2567^2 + 283^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1667393 + ... + 1667396.

Almost surely, 2^6669578 is an apocalyptic number.

6669578 is a deficient number, since it is larger than the sum of its proper divisors (3334792).

6669578 is a wasteful number, since it uses less digits than its factorization.

6669578 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3334791.

The product of its digits is 544320, while the sum is 47.

The square root of 6669578 is about 2582.5526132104. The cubic root of 6669578 is about 188.2345984847.

The spelling of 6669578 in words is "six million, six hundred sixty-nine thousand, five hundred seventy-eight".