65444431 has 8 divisors (see below), whose sum is σ = 70850304. Its totient is φ = 60091680.

The previous prime is 65444419. The next prime is 65444437. The reversal of 65444431 is 13444456.

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

It is a cyclic number.

It is not a de Polignac number, because 65444431 - 2¹⁷ = 65313359 is a prime.

It is a super-2 number, since 2×65444431² = 8565947097827522, which contains 22 as substring.

It is a nialpdrome in base 10.

It is a junction number, because it is equal to n+sod(n) for n = 65444393 and 65444402.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65444437) 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, 10696 + ... + 15661.

It is an arithmetic number, because the mean of its divisors is an integer number (8856288).

Almost surely, 2^65444431 is an apocalyptic number.

65444431 is a deficient number, since it is larger than the sum of its proper divisors (5405873).

65444431 is a wasteful number, since it uses less digits than its factorization.

65444431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26561.

The product of its digits is 23040, while the sum is 31.

The square root of 65444431 is about 8089.7732353880. The cubic root of 65444431 is about 402.9868722210.

Adding to 65444431 its reverse (13444456), we get a palindrome (78888887).

The spelling of 65444431 in words is "sixty-five million, four hundred forty-four thousand, four hundred thirty-one".