64438823 has 8 divisors (see below), whose sum is σ = 71820720. Its totient is φ = 57456000.

The previous prime is 64438813. The next prime is 64438837. The reversal of 64438823 is 32883446.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 64438823 - 2⁴ = 64438807 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64438813) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 99428 + ... + 100073.

It is an arithmetic number, because the mean of its divisors is an integer number (8977590).

Almost surely, 2^64438823 is an apocalyptic number.

64438823 is a deficient number, since it is larger than the sum of its proper divisors (7381897).

64438823 is a wasteful number, since it uses less digits than its factorization.

64438823 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 199537.

The product of its digits is 110592, while the sum is 38.

The square root of 64438823 is about 8027.3795848957. The cubic root of 64438823 is about 400.9121330356.

The spelling of 64438823 in words is "sixty-four million, four hundred thirty-eight thousand, eight hundred twenty-three".