42668643 has 4 divisors (see below), whose sum is σ = 56891528. Its totient is φ = 28445760.

The previous prime is 42668629. The next prime is 42668693. The reversal of 42668643 is 34686624.

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

It is not a de Polignac number, because 42668643 - 2⁴ = 42668627 is a prime.

It is a super-2 number, since 2×42668643² = 3641226190922898, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (42668693) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7111438 + ... + 7111443.

It is an arithmetic number, because the mean of its divisors is an integer number (14222882).

Almost surely, 2^42668643 is an apocalyptic number.

42668643 is a deficient number, since it is larger than the sum of its proper divisors (14222885).

42668643 is a wasteful number, since it uses less digits than its factorization.

42668643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14222884.

The product of its digits is 165888, while the sum is 39.

The square root of 42668643 is about 6532.1239271771. The cubic root of 42668643 is about 349.4375810806.

The spelling of 42668643 in words is "forty-two million, six hundred sixty-eight thousand, six hundred forty-three".