642090346 has 16 divisors (see below), whose sum is σ = 991293120. Its totient is φ = 311794560.

The previous prime is 642090311. The next prime is 642090377. The reversal of 642090346 is 643090246.

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 7 ways as a sum of consecutive naturals, for example, 24231 + ... + 43258.

It is an arithmetic number, because the mean of its divisors is an integer number (61955820).

Almost surely, 2^642090346 is an apocalyptic number.

642090346 is a deficient number, since it is larger than the sum of its proper divisors (349202774).

642090346 is a wasteful number, since it uses less digits than its factorization.

642090346 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 67629.

The product of its (nonzero) digits is 31104, while the sum is 34.

The square root of 642090346 is about 25339.5016920223. The cubic root of 642090346 is about 862.7110884586.

The spelling of 642090346 in words is "six hundred forty-two million, ninety thousand, three hundred forty-six".