64144331 has 4 divisors (see below), whose sum is σ = 65509152. Its totient is φ = 62779512.

The previous prime is 64144219. The next prime is 64144343. The reversal of 64144331 is 13344146.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 64144331 - 2¹⁸ = 63882187 is a prime.

It is a super-2 number, since 2×64144331² = 8228990398875122, 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 64144331.

It is not an unprimeable number, because it can be changed into a prime (64144831) 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, 682340 + ... + 682433.

It is an arithmetic number, because the mean of its divisors is an integer number (16377288).

Almost surely, 2^64144331 is an apocalyptic number.

64144331 is a deficient number, since it is larger than the sum of its proper divisors (1364821).

64144331 is a wasteful number, since it uses less digits than its factorization.

64144331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1364820.

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

The square root of 64144331 is about 8009.0156074264. The cubic root of 64144331 is about 400.3004638305.

Adding to 64144331 its reverse (13344146), we get a palindrome (77488477).

The spelling of 64144331 in words is "sixty-four million, one hundred forty-four thousand, three hundred thirty-one".