642835906 has 8 divisors (see below), whose sum is σ = 965445264. Its totient is φ = 321020820.

The previous prime is 642835889. The next prime is 642835931. The reversal of 642835906 is 609538246.

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 (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 196540 + ... + 199783.

It is an arithmetic number, because the mean of its divisors is an integer number (120680658).

Almost surely, 2^642835906 is an apocalyptic number.

642835906 is a deficient number, since it is larger than the sum of its proper divisors (322609358).

642835906 is a wasteful number, since it uses less digits than its factorization.

642835906 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 397136.

The product of its (nonzero) digits is 311040, while the sum is 43.

The square root of 642835906 is about 25354.2088419260. The cubic root of 642835906 is about 863.0448701935.

The spelling of 642835906 in words is "six hundred forty-two million, eight hundred thirty-five thousand, nine hundred six".