64445938 has 4 divisors (see below), whose sum is σ = 96668910. Its totient is φ = 32222968.

The previous prime is 64445921. The next prime is 64445939. The reversal of 64445938 is 83954446.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 83954446 = 2 ⋅41977223.

It can be written as a sum of positive squares in only one way, i.e., 55995289 + 8450649 = 7483^2 + 2907^2 .

It is a junction number, because it is equal to n+sod(n) for n = 64445894 and 64445903.

It is not an unprimeable number, because it can be changed into a prime (64445939) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16111483 + ... + 16111486.

Almost surely, 2^64445938 is an apocalyptic number.

64445938 is a deficient number, since it is larger than the sum of its proper divisors (32222972).

64445938 is a wasteful number, since it uses less digits than its factorization.

64445938 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32222971.

The product of its digits is 414720, while the sum is 43.

The square root of 64445938 is about 8027.8227434342. The cubic root of 64445938 is about 400.9268880374.

The spelling of 64445938 in words is "sixty-four million, four hundred forty-five thousand, nine hundred thirty-eight".