642508673 has 8 divisors (see below), whose sum is σ = 647964000. Its totient is φ = 637072128.

The previous prime is 642508661. The next prime is 642508687. The reversal of 642508673 is 376805246.

It is a happy number.

642508673 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 642508673 - 2¹⁴ = 642492289 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 642508673.

It is not an unprimeable number, because it can be changed into a prime (642508613) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 68798 + ... + 77576.

It is an arithmetic number, because the mean of its divisors is an integer number (80995500).

Almost surely, 2^642508673 is an apocalyptic number.

It is an amenable number.

642508673 is a deficient number, since it is larger than the sum of its proper divisors (5455327).

642508673 is a wasteful number, since it uses less digits than its factorization.

642508673 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9391.

The product of its (nonzero) digits is 241920, while the sum is 41.

The square root of 642508673 is about 25347.7547920915. The cubic root of 642508673 is about 862.8984021789.

The spelling of 642508673 in words is "six hundred forty-two million, five hundred eight thousand, six hundred seventy-three".