64642143 has 16 divisors (see below), whose sum is σ = 92365056. Its totient is φ = 40068480.

The previous prime is 64642141. The next prime is 64642147. The reversal of 64642143 is 34124646.

It is not a de Polignac number, because 64642143 - 2¹ = 64642141 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 64642143.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64642141) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3403 + ... + 11868.

It is an arithmetic number, because the mean of its divisors is an integer number (5772816).

Almost surely, 2^64642143 is an apocalyptic number.

64642143 is a deficient number, since it is larger than the sum of its proper divisors (27722913).

64642143 is a wasteful number, since it uses less digits than its factorization.

64642143 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15374.

The product of its digits is 13824, while the sum is 30.

The square root of 64642143 is about 8040.0337685858. The cubic root of 64642143 is about 401.3333484331. Note that the first 4 decimals are identical.

Adding to 64642143 its reverse (34124646), we get a palindrome (98766789).

The spelling of 64642143 in words is "sixty-four million, six hundred forty-two thousand, one hundred forty-three".