642366635 has 8 divisors (see below), whose sum is σ = 776910336. Its totient is φ = 509846400.

The previous prime is 642366589. The next prime is 642366671. The reversal of 642366635 is 536663246.

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

It is not a de Polignac number, because 642366635 - 2¹⁰ = 642365611 is a prime.

It is a super-2 number, since 2×642366635² = 825269787522446450, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 642366592 and 642366601.

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, 505166 + ... + 506435.

It is an arithmetic number, because the mean of its divisors is an integer number (97113792).

Almost surely, 2^642366635 is an apocalyptic number.

642366635 is a deficient number, since it is larger than the sum of its proper divisors (134543701).

642366635 is a wasteful number, since it uses less digits than its factorization.

642366635 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1011733.

The product of its digits is 466560, while the sum is 41.

The square root of 642366635 is about 25344.9528506170. The cubic root of 642366635 is about 862.8348111327.

The spelling of 642366635 in words is "six hundred forty-two million, three hundred sixty-six thousand, six hundred thirty-five".