64142643 has 4 divisors (see below), whose sum is σ = 85523528. Its totient is φ = 42761760.

The previous prime is 64142641. The next prime is 64142647. The reversal of 64142643 is 34624146.

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

It is not a de Polignac number, because 64142643 - 2¹ = 64142641 is a prime.

It is a super-2 number, since 2×64142643² = 8228557302050898, 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 64142643.

It is not an unprimeable number, because it can be changed into a prime (64142641) 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, 10690438 + ... + 10690443.

It is an arithmetic number, because the mean of its divisors is an integer number (21380882).

Almost surely, 2^64142643 is an apocalyptic number.

64142643 is a deficient number, since it is larger than the sum of its proper divisors (21380885).

64142643 is a wasteful number, since it uses less digits than its factorization.

64142643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21380884.

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

The square root of 64142643 is about 8008.9102254926. The cubic root of 64142643 is about 400.2969524103.

Adding to 64142643 its reverse (34624146), we get a palindrome (98766789).

The spelling of 64142643 in words is "sixty-four million, one hundred forty-two thousand, six hundred forty-three".