66426004 has 12 divisors (see below), whose sum is σ = 123083604. Its totient is φ = 31259264.

The previous prime is 66425999. The next prime is 66426007. The reversal of 66426004 is 40062466.

It can be written as a sum of positive squares in 2 ways, for example, as 50410000 + 16016004 = 7100^2 + 4002^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66426007) 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, 488359 + ... + 488494.

It is an arithmetic number, because the mean of its divisors is an integer number (10256967).

Almost surely, 2^66426004 is an apocalyptic number.

It is an amenable number.

66426004 is a deficient number, since it is larger than the sum of its proper divisors (56657600).

66426004 is a wasteful number, since it uses less digits than its factorization.

66426004 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 976874 (or 976872 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 28.

The square root of 66426004 is about 8150.2149664901. The cubic root of 66426004 is about 404.9916250872.

The spelling of 66426004 in words is "sixty-six million, four hundred twenty-six thousand, four".