64441331 has 16 divisors (see below), whose sum is σ = 71193600. Its totient is φ = 58056768.

The previous prime is 64441319. The next prime is 64441357. The reversal of 64441331 is 13314446.

It is a cyclic number.

It is not a de Polignac number, because 64441331 - 2¹⁴ = 64424947 is a prime.

It is a super-2 number, since 2×64441331² = 8305370282103122, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 64441331.

It is not an unprimeable number, because it can be changed into a prime (64441031) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 104135 + ... + 104751.

It is an arithmetic number, because the mean of its divisors is an integer number (4449600).

Almost surely, 2^64441331 is an apocalyptic number.

64441331 is a deficient number, since it is larger than the sum of its proper divisors (6752269).

64441331 is a wasteful number, since it uses less digits than its factorization.

64441331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 898.

The product of its digits is 3456, while the sum is 26.

The square root of 64441331 is about 8027.5357987367. The cubic root of 64441331 is about 400.9173342200.

Adding to 64441331 its reverse (13314446), we get a palindrome (77755777).

The spelling of 64441331 in words is "sixty-four million, four hundred forty-one thousand, three hundred thirty-one".