642636683 has 16 divisors (see below), whose sum is σ = 713437536. Its totient is φ = 575009280.

The previous prime is 642636667. The next prime is 642636689. The reversal of 642636683 is 386636246.

It is a cyclic number.

It is not a de Polignac number, because 642636683 - 2⁴ = 642636667 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (642636689) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 133763 + ... + 138483.

It is an arithmetic number, because the mean of its divisors is an integer number (44589846).

Almost surely, 2^642636683 is an apocalyptic number.

642636683 is a deficient number, since it is larger than the sum of its proper divisors (70800853).

642636683 is a wasteful number, since it uses less digits than its factorization.

642636683 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5054.

The product of its digits is 746496, while the sum is 44.

The square root of 642636683 is about 25350.2797420462. The cubic root of 642636683 is about 862.9557047981.

The spelling of 642636683 in words is "six hundred forty-two million, six hundred thirty-six thousand, six hundred eighty-three".