64144139 has 4 divisors (see below), whose sum is σ = 64165056. Its totient is φ = 64123224.

The previous prime is 64144121. The next prime is 64144141. The reversal of 64144139 is 93144146.

It is a happy number.

64144139 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 64144139 - 2⁸ = 64143883 is a prime.

It is a super-2 number, since 2×64144139² = 8228941136102642, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (64144109) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4859 + ... + 12324.

It is an arithmetic number, because the mean of its divisors is an integer number (16041264).

Almost surely, 2^64144139 is an apocalyptic number.

64144139 is a deficient number, since it is larger than the sum of its proper divisors (20917).

64144139 is a wasteful number, since it uses less digits than its factorization.

64144139 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20916.

The product of its digits is 10368, while the sum is 32.

The square root of 64144139 is about 8009.0036209256. The cubic root of 64144139 is about 400.3000644304.

The spelling of 64144139 in words is "sixty-four million, one hundred forty-four thousand, one hundred thirty-nine".