642786662 has 8 divisors (see below), whose sum is σ = 1101920016. Its totient is φ = 275479992.

The previous prime is 642786647. The next prime is 642786679. The reversal of 642786662 is 266687246.

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

It is a congruent number.

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, 22956653 + ... + 22956680.

It is an arithmetic number, because the mean of its divisors is an integer number (137740002).

Almost surely, 2^642786662 is an apocalyptic number.

642786662 is a deficient number, since it is larger than the sum of its proper divisors (459133354).

642786662 is a wasteful number, since it uses less digits than its factorization.

642786662 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45913342.

The product of its digits is 1161216, while the sum is 47.

The square root of 642786662 is about 25353.2377025105. The cubic root of 642786662 is about 863.0228319789.

The spelling of 642786662 in words is "six hundred forty-two million, seven hundred eighty-six thousand, six hundred sixty-two".