642837871 has 8 divisors (see below), whose sum is σ = 692486144. Its totient is φ = 593218080.

The previous prime is 642837869. The next prime is 642837907. The reversal of 642837871 is 178738246.

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

It is not a de Polignac number, because 642837871 - 2¹ = 642837869 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (642837821) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 74386 + ... + 82576.

It is an arithmetic number, because the mean of its divisors is an integer number (86560768).

Almost surely, 2^642837871 is an apocalyptic number.

642837871 is a deficient number, since it is larger than the sum of its proper divisors (49648273).

642837871 is a wasteful number, since it uses less digits than its factorization.

642837871 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14241.

The product of its digits is 451584, while the sum is 46.

The square root of 642837871 is about 25354.2475928591. The cubic root of 642837871 is about 863.0457495685.

The spelling of 642837871 in words is "six hundred forty-two million, eight hundred thirty-seven thousand, eight hundred seventy-one".