664707426 has 16 divisors (see below), whose sum is σ = 1329781728. Its totient is φ = 221508000.

The previous prime is 664707403. The next prime is 664707437. The reversal of 664707426 is 624707466.

664707426 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12021 + ... + 38391.

It is an arithmetic number, because the mean of its divisors is an integer number (83111358).

Almost surely, 2^664707426 is an apocalyptic number.

664707426 is an abundant number, since it is smaller than the sum of its proper divisors (665074302).

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

664707426 is a wasteful number, since it uses less digits than its factorization.

664707426 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30577.

The product of its (nonzero) digits is 338688, while the sum is 42.

The square root of 664707426 is about 25781.9205258258. The cubic root of 664707426 is about 872.7238478421.

The spelling of 664707426 in words is "six hundred sixty-four million, seven hundred seven thousand, four hundred twenty-six".