664423026 has 16 divisors (see below), whose sum is σ = 1329182400. Its totient is φ = 221418288.

The previous prime is 664423021. The next prime is 664423037. The reversal of 664423026 is 620324466.

664423026 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (664423021) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16920 + ... + 40188.

It is an arithmetic number, because the mean of its divisors is an integer number (83073900).

Almost surely, 2^664423026 is an apocalyptic number.

664423026 is an abundant number, since it is smaller than the sum of its proper divisors (664759374).

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

664423026 is a wasteful number, since it uses less digits than its factorization.

664423026 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28033.

The product of its (nonzero) digits is 41472, while the sum is 33.

The square root of 664423026 is about 25776.4044428233. The cubic root of 664423026 is about 872.5993629637.

The spelling of 664423026 in words is "six hundred sixty-four million, four hundred twenty-three thousand, twenty-six".