642544075 has 6 divisors (see below), whose sum is σ = 796754684. Its totient is φ = 514035240.

The previous prime is 642544073. The next prime is 642544081. The reversal of 642544075 is 570445246.

642544075 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 642544075 - 2¹ = 642544073 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (642544073) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 12850857 + ... + 12850906.

Almost surely, 2^642544075 is an apocalyptic number.

642544075 is a deficient number, since it is larger than the sum of its proper divisors (154210609).

642544075 is a wasteful number, since it uses less digits than its factorization.

642544075 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25701773 (or 25701768 counting only the distinct ones).

The product of its (nonzero) digits is 134400, while the sum is 37.

The square root of 642544075 is about 25348.4531086218. The cubic root of 642544075 is about 862.9142503531.

The spelling of 642544075 in words is "six hundred forty-two million, five hundred forty-four thousand, seventy-five".