64638338 has 4 divisors (see below), whose sum is σ = 96957510. Its totient is φ = 32319168.

The previous prime is 64638337. The next prime is 64638341. The reversal of 64638338 is 83383646.

64638338 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: 83383646 = 2 ⋅41691823.

It can be written as a sum of positive squares in only one way, i.e., 61669609 + 2968729 = 7853^2 + 1723^2 .

It is a super-2 number, since 2×64638338² = 8356229478804488, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 64638295 and 64638304.

It is not an unprimeable number, because it can be changed into a prime (64638337) 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 as a sum of consecutive naturals, namely, 16159583 + ... + 16159586.

Almost surely, 2^64638338 is an apocalyptic number.

64638338 is a deficient number, since it is larger than the sum of its proper divisors (32319172).

64638338 is a wasteful number, since it uses less digits than its factorization.

64638338 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32319171.

The product of its digits is 248832, while the sum is 41.

The square root of 64638338 is about 8039.7971367442. The cubic root of 64638338 is about 401.3254737800.

The spelling of 64638338 in words is "sixty-four million, six hundred thirty-eight thousand, three hundred thirty-eight".