64444431 has 8 divisors (see below), whose sum is σ = 86544640. Its totient is φ = 42653592.

The previous prime is 64444427. The next prime is 64444439. The reversal of 64444431 is 13444446.

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

It is not a de Polignac number, because 64444431 - 2² = 64444427 is a prime.

It is a super-2 number, since 2×64444431² = 8306169373827522, which contains 22 as substring.

It is a Duffinian number.

It is a nialpdrome in base 10.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64444439) 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, 76855 + ... + 77688.

It is an arithmetic number, because the mean of its divisors is an integer number (10818080).

Almost surely, 2^64444431 is an apocalyptic number.

64444431 is a deficient number, since it is larger than the sum of its proper divisors (22100209).

64444431 is a wasteful number, since it uses less digits than its factorization.

64444431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 154685.

The product of its digits is 18432, while the sum is 30.

The square root of 64444431 is about 8027.7288818196. The cubic root of 64444431 is about 400.9237629295.

Adding to 64444431 its reverse (13444446), we get a palindrome (77888877).

The spelling of 64444431 in words is "sixty-four million, four hundred forty-four thousand, four hundred thirty-one".