642560686 has 8 divisors (see below), whose sum is σ = 978226920. Its totient is φ = 316485048.

The previous prime is 642560663. The next prime is 642560717. The reversal of 642560686 is 686065246.

642560686 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 congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2397481 + ... + 2397748.

It is an arithmetic number, because the mean of its divisors is an integer number (122278365).

Almost surely, 2^642560686 is an apocalyptic number.

642560686 is a deficient number, since it is larger than the sum of its proper divisors (335666234).

642560686 is a wasteful number, since it uses less digits than its factorization.

642560686 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4795298.

The product of its (nonzero) digits is 414720, while the sum is 43.

The square root of 642560686 is about 25348.7807596342. The cubic root of 642560686 is about 862.9216862866.

The spelling of 642560686 in words is "six hundred forty-two million, five hundred sixty thousand, six hundred eighty-six".