642125206 has 8 divisors (see below), whose sum is σ = 965038104. Its totient is φ = 320445840.

The previous prime is 642125177. The next prime is 642125219. The reversal of 642125206 is 602521246.

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

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 3 ways as a sum of consecutive naturals, for example, 307080 + ... + 309163.

It is an arithmetic number, because the mean of its divisors is an integer number (120629763).

Almost surely, 2^642125206 is an apocalyptic number.

642125206 is a deficient number, since it is larger than the sum of its proper divisors (322912898).

642125206 is a wasteful number, since it uses less digits than its factorization.

642125206 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 616766.

The product of its (nonzero) digits is 5760, while the sum is 28.

The square root of 642125206 is about 25340.1895415169. The cubic root of 642125206 is about 862.7267007809.

The spelling of 642125206 in words is "six hundred forty-two million, one hundred twenty-five thousand, two hundred six".