64423445 has 4 divisors (see below), whose sum is σ = 77308140. Its totient is φ = 51538752.

The previous prime is 64423439. The next prime is 64423453. The reversal of 64423445 is 54432446.

64423445 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, and also an emirpimes, since its reverse is a distinct semiprime: 54432446 = 2 ⋅27216223.

It can be written as a sum of positive squares in 2 ways, for example, as 30980356 + 33443089 = 5566^2 + 5783^2 .

It is a cyclic number.

It is not a de Polignac number, because 64423445 - 2²⁰ = 63374869 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, 6442340 + ... + 6442349.

It is an arithmetic number, because the mean of its divisors is an integer number (19327035).

Almost surely, 2^64423445 is an apocalyptic number.

It is an amenable number.

64423445 is a deficient number, since it is larger than the sum of its proper divisors (12884695).

64423445 is a wasteful number, since it uses less digits than its factorization.

64423445 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12884694.

The product of its digits is 46080, while the sum is 32.

The square root of 64423445 is about 8026.4216809236. The cubic root of 64423445 is about 400.8802386124.

Subtracting from 64423445 its reverse (54432446), we obtain a palindrome (9990999).

The spelling of 64423445 in words is "sixty-four million, four hundred twenty-three thousand, four hundred forty-five".