642040658 has 8 divisors (see below), whose sum is σ = 1100641152. Its totient is φ = 275160276.

The previous prime is 642040639. The next prime is 642040669. The reversal of 642040658 is 856040246.

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

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 22930010 + ... + 22930037.

It is an arithmetic number, because the mean of its divisors is an integer number (137580144).

Almost surely, 2^642040658 is an apocalyptic number.

642040658 is a deficient number, since it is larger than the sum of its proper divisors (458600494).

642040658 is a wasteful number, since it uses less digits than its factorization.

642040658 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45860056.

The product of its (nonzero) digits is 46080, while the sum is 35.

The square root of 642040658 is about 25338.5212275697. The cubic root of 642040658 is about 862.6888343243.

The spelling of 642040658 in words is "six hundred forty-two million, forty thousand, six hundred fifty-eight".