64438193 has 4 divisors (see below), whose sum is σ = 64865088. Its totient is φ = 64011300.

The previous prime is 64438189. The next prime is 64438217. The reversal of 64438193 is 39183446.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 39183446 = 2 ⋅19591723.

It is a cyclic number.

It is not a de Polignac number, because 64438193 - 2² = 64438189 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (64438103) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 213221 + ... + 213522.

It is an arithmetic number, because the mean of its divisors is an integer number (16216272).

Almost surely, 2^64438193 is an apocalyptic number.

It is an amenable number.

64438193 is a deficient number, since it is larger than the sum of its proper divisors (426895).

64438193 is a wasteful number, since it uses less digits than its factorization.

64438193 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 426894.

The product of its digits is 62208, while the sum is 38.

The square root of 64438193 is about 8027.3403440990. The cubic root of 64438193 is about 400.9108264968.

The spelling of 64438193 in words is "sixty-four million, four hundred thirty-eight thousand, one hundred ninety-three".