642993682 has 8 divisors (see below), whose sum is σ = 980838000. Its totient is φ = 316047684.

The previous prime is 642993667. The next prime is 642993691. The reversal of 642993682 is 286399246.

It is a happy number.

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

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 3 ways as a sum of consecutive naturals, for example, 2724432 + ... + 2724667.

It is an arithmetic number, because the mean of its divisors is an integer number (122604750).

Almost surely, 2^642993682 is an apocalyptic number.

642993682 is a deficient number, since it is larger than the sum of its proper divisors (337844318).

642993682 is a wasteful number, since it uses less digits than its factorization.

642993682 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5449160.

The product of its digits is 1119744, while the sum is 49.

The square root of 642993682 is about 25357.3200871070. The cubic root of 642993682 is about 863.1154722592.

The spelling of 642993682 in words is "six hundred forty-two million, nine hundred ninety-three thousand, six hundred eighty-two".