642637958 has 16 divisors (see below), whose sum is σ = 976736880. Its totient is φ = 317068416.

The previous prime is 642637921. The next prime is 642637979. The reversal of 642637958 is 859736246.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 180338 + ... + 183866.

It is an arithmetic number, because the mean of its divisors is an integer number (61046055).

Almost surely, 2^642637958 is an apocalyptic number.

642637958 is a deficient number, since it is larger than the sum of its proper divisors (334098922).

642637958 is a wasteful number, since it uses less digits than its factorization.

642637958 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4711.

The product of its digits is 2177280, while the sum is 50.

The square root of 642637958 is about 25350.3048896853. The cubic root of 642637958 is about 862.9562755030.

The spelling of 642637958 in words is "six hundred forty-two million, six hundred thirty-seven thousand, nine hundred fifty-eight".