642208794 has 8 divisors (see below), whose sum is σ = 1284417600. Its totient is φ = 214069596.

The previous prime is 642208747. The next prime is 642208823. The reversal of 642208794 is 497802246.

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

642208794 is an admirable 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, 53517394 + ... + 53517405.

It is an arithmetic number, because the mean of its divisors is an integer number (160552200).

Almost surely, 2^642208794 is an apocalyptic number.

642208794 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

642208794 is a wasteful number, since it uses less digits than its factorization.

642208794 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 107034804.

The product of its (nonzero) digits is 193536, while the sum is 42.

The square root of 642208794 is about 25341.8388046329. The cubic root of 642208794 is about 862.7641340156.

The spelling of 642208794 in words is "six hundred forty-two million, two hundred eight thousand, seven hundred ninety-four".