42643645 has 16 divisors (see below), whose sum is σ = 56064960. Its totient is φ = 30880000.

The previous prime is 42643637. The next prime is 42643661. The reversal of 42643645 is 54634624.

42643645 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 42643645 - 2³ = 42643637 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 42643645.

It is a congruent number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 12261 + ... + 15349.

It is an arithmetic number, because the mean of its divisors is an integer number (3504060).

Almost surely, 2^42643645 is an apocalyptic number.

It is an amenable number.

42643645 is a deficient number, since it is larger than the sum of its proper divisors (13421315).

42643645 is a wasteful number, since it uses less digits than its factorization.

42643645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3356.

The product of its digits is 69120, while the sum is 34.

The square root of 42643645 is about 6530.2101803847. The cubic root of 42643645 is about 349.3693268430.

The spelling of 42643645 in words is "forty-two million, six hundred forty-three thousand, six hundred forty-five".