6664426 has 4 divisors (see below), whose sum is σ = 9996642. Its totient is φ = 3332212.

The previous prime is 6664417. The next prime is 6664429. The reversal of 6664426 is 6244666.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 5452225 + 1212201 = 2335^2 + 1101^2 .

It is a junction number, because it is equal to n+sod(n) for n = 6664391 and 6664400.

It is not an unprimeable number, because it can be changed into a prime (6664429) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1666105 + ... + 1666108.

Almost surely, 2^6664426 is an apocalyptic number.

6664426 is a deficient number, since it is larger than the sum of its proper divisors (3332216).

6664426 is a wasteful number, since it uses less digits than its factorization.

6664426 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3332215.

The product of its digits is 41472, while the sum is 34.

The square root of 6664426 is about 2581.5549577725. The cubic root of 6664426 is about 188.1861179329.

The spelling of 6664426 in words is "six million, six hundred sixty-four thousand, four hundred twenty-six".