42664445 has 4 divisors (see below), whose sum is σ = 51197340. Its totient is φ = 34131552.

The previous prime is 42664381. The next prime is 42664451. The reversal of 42664445 is 54446624.

42664445 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It can be written as a sum of positive squares in 2 ways, for example, as 23145721 + 19518724 = 4811^2 + 4418^2 .

It is a cyclic number.

It is not a de Polignac number, because 42664445 - 2⁶ = 42664381 is a prime.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4266440 + ... + 4266449.

It is an arithmetic number, because the mean of its divisors is an integer number (12799335).

Almost surely, 2^42664445 is an apocalyptic number.

It is an amenable number.

42664445 is a deficient number, since it is larger than the sum of its proper divisors (8532895).

42664445 is an equidigital number, since it uses as much as digits as its factorization.

42664445 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8532894.

The product of its digits is 92160, while the sum is 35.

The square root of 42664445 is about 6531.8025842795. The cubic root of 42664445 is about 349.4261207749.

The spelling of 42664445 in words is "forty-two million, six hundred sixty-four thousand, four hundred forty-five".