664443742 has 16 divisors (see below), whose sum is σ = 1056078000. Its totient is φ = 312446848.

The previous prime is 664443727. The next prime is 664443749. The reversal of 664443742 is 247344466.

It is a junction number, because it is equal to n+sod(n) for n = 664443695 and 664443704.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (664443749) 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, 44448 + ... + 57484.

It is an arithmetic number, because the mean of its divisors is an integer number (66004875).

Almost surely, 2^664443742 is an apocalyptic number.

664443742 is a deficient number, since it is larger than the sum of its proper divisors (391634258).

664443742 is a wasteful number, since it uses less digits than its factorization.

664443742 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14555.

The product of its digits is 387072, while the sum is 40.

The square root of 664443742 is about 25776.8062800650. The cubic root of 664443742 is about 872.6084317747.

The spelling of 664443742 in words is "six hundred sixty-four million, four hundred forty-three thousand, seven hundred forty-two".