642440170 has 8 divisors (see below), whose sum is σ = 1156392324. Its totient is φ = 256976064.

The previous prime is 642440159. The next prime is 642440231. The reversal of 642440170 is 71044246.

It can be written as a sum of positive squares in 2 ways, for example, as 583657281 + 58782889 = 24159^2 + 7667^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 32121999 + ... + 32122018.

Almost surely, 2^642440170 is an apocalyptic number.

642440170 is a deficient number, since it is larger than the sum of its proper divisors (513952154).

642440170 is a wasteful number, since it uses less digits than its factorization.

642440170 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64244024.

The product of its (nonzero) digits is 5376, while the sum is 28.

The square root of 642440170 is about 25346.4034924089. The cubic root of 642440170 is about 862.8677342504.

The spelling of 642440170 in words is "six hundred forty-two million, four hundred forty thousand, one hundred seventy".