642986605 has 8 divisors (see below), whose sum is σ = 783100512. Its totient is φ = 506711568.

The previous prime is 642986599. The next prime is 642986623. The reversal of 642986605 is 506689246.

642986605 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a cyclic number.

It is not a de Polignac number, because 642986605 - 2⁹ = 642986093 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 959347 + ... + 960016.

It is an arithmetic number, because the mean of its divisors is an integer number (97887564).

Almost surely, 2^642986605 is an apocalyptic number.

It is an amenable number.

642986605 is a deficient number, since it is larger than the sum of its proper divisors (140113907).

642986605 is a wasteful number, since it uses less digits than its factorization.

642986605 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1919435.

The product of its (nonzero) digits is 622080, while the sum is 46.

The square root of 642986605 is about 25357.1805412195. The cubic root of 642986605 is about 863.1123056700.

The spelling of 642986605 in words is "six hundred forty-two million, nine hundred eighty-six thousand, six hundred five".