642857361 has 8 divisors (see below), whose sum is σ = 861451200. Its totient is φ = 426417552.

The previous prime is 642857321. The next prime is 642857377. The reversal of 642857361 is 163758246.

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

It is not a de Polignac number, because 642857361 - 2⁷ = 642857233 is a prime.

It is not an unprimeable number, because it can be changed into a prime (642857321) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 537810 + ... + 539003.

It is an arithmetic number, because the mean of its divisors is an integer number (107681400).

Almost surely, 2^642857361 is an apocalyptic number.

It is an amenable number.

642857361 is a deficient number, since it is larger than the sum of its proper divisors (218593839).

642857361 is a wasteful number, since it uses less digits than its factorization.

642857361 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1077015.

The product of its digits is 241920, while the sum is 42.

The square root of 642857361 is about 25354.6319436903. The cubic root of 642857361 is about 863.0544716182.

The spelling of 642857361 in words is "six hundred forty-two million, eight hundred fifty-seven thousand, three hundred sixty-one".