64872143 has 4 divisors (see below), whose sum is σ = 74139600. Its totient is φ = 55604688.

The previous prime is 64872133. The next prime is 64872149. The reversal of 64872143 is 34127846.

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 64872143 - 2¹⁶ = 64806607 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64872149) 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, 4633718 + ... + 4633731.

It is an arithmetic number, because the mean of its divisors is an integer number (18534900).

Almost surely, 2^64872143 is an apocalyptic number.

64872143 is a deficient number, since it is larger than the sum of its proper divisors (9267457).

64872143 is an equidigital number, since it uses as much as digits as its factorization.

64872143 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9267456.

The product of its digits is 32256, while the sum is 35.

The square root of 64872143 is about 8054.3244906075. The cubic root of 64872143 is about 401.8087731045.

Adding to 64872143 its reverse (34127846), we get a palindrome (98999989).

The spelling of 64872143 in words is "sixty-four million, eight hundred seventy-two thousand, one hundred forty-three".