642438965 has 8 divisors (see below), whose sum is σ = 881059200. Its totient is φ = 440529552.

The previous prime is 642438941. The next prime is 642438971. The reversal of 642438965 is 569834246.

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 642438965 - 2²² = 638244661 is a prime.

It is a congruent number.

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, 9177665 + ... + 9177734.

It is an arithmetic number, because the mean of its divisors is an integer number (110132400).

Almost surely, 2^642438965 is an apocalyptic number.

It is an amenable number.

642438965 is a deficient number, since it is larger than the sum of its proper divisors (238620235).

642438965 is a wasteful number, since it uses less digits than its factorization.

642438965 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18355411.

The product of its digits is 1244160, while the sum is 47.

The square root of 642438965 is about 25346.3797217670. The cubic root of 642438965 is about 862.8671947676.

The spelling of 642438965 in words is "six hundred forty-two million, four hundred thirty-eight thousand, nine hundred sixty-five".