64442393 has 4 divisors (see below), whose sum is σ = 68233140. Its totient is φ = 60651648.

The previous prime is 64442381. The next prime is 64442401. The reversal of 64442393 is 39324446.

64442393 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 54125449 + 10316944 = 7357^2 + 3212^2 .

It is not a de Polignac number, because 64442393 - 2¹⁴ = 64426009 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (64442303) by changing a digit.

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, 1895348 + ... + 1895381.

It is an arithmetic number, because the mean of its divisors is an integer number (17058285).

Almost surely, 2^64442393 is an apocalyptic number.

It is an amenable number.

64442393 is a deficient number, since it is larger than the sum of its proper divisors (3790747).

64442393 is a wasteful number, since it uses less digits than its factorization.

64442393 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3790746.

The product of its digits is 62208, while the sum is 35.

The square root of 64442393 is about 8027.6019457868. The cubic root of 64442393 is about 400.9195365946.

The spelling of 64442393 in words is "sixty-four million, four hundred forty-two thousand, three hundred ninety-three".