642420677 has 8 divisors (see below), whose sum is σ = 675877272. Its totient is φ = 609811200.

The previous prime is 642420661. The next prime is 642420679. The reversal of 642420677 is 776024246.

642420677 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 961 + 642419716 = 31^2 + 25346^2 .

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 642420677 - 2⁴ = 642420661 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 642420677.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (642420679) 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, 210224 + ... + 213257.

It is an arithmetic number, because the mean of its divisors is an integer number (84484659).

Almost surely, 2^642420677 is an apocalyptic number.

It is an amenable number.

642420677 is a deficient number, since it is larger than the sum of its proper divisors (33456595).

642420677 is a wasteful number, since it uses less digits than its factorization.

642420677 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 423559.

The product of its (nonzero) digits is 112896, while the sum is 38.

The square root of 642420677 is about 25346.0189576194. The cubic root of 642420677 is about 862.8590070819.

The spelling of 642420677 in words is "six hundred forty-two million, four hundred twenty thousand, six hundred seventy-seven".