642806107 has 8 divisors (see below), whose sum is σ = 655828992. Its totient is φ = 629884200.

The previous prime is 642806063. The next prime is 642806113. The reversal of 642806107 is 701608246.

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 642806107 - 2²³ = 634417499 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (642806147) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12319 + ... + 37912.

It is an arithmetic number, because the mean of its divisors is an integer number (81978624).

Almost surely, 2^642806107 is an apocalyptic number.

642806107 is a gapful number since it is divisible by the number (67) formed by its first and last digit.

642806107 is a deficient number, since it is larger than the sum of its proper divisors (13022885).

642806107 is a wasteful number, since it uses less digits than its factorization.

642806107 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50489.

The product of its (nonzero) digits is 16128, while the sum is 34.

The square root of 642806107 is about 25353.6211812041. The cubic root of 642806107 is about 863.0315343529.

The spelling of 642806107 in words is "six hundred forty-two million, eight hundred six thousand, one hundred seven".