642810007 has 4 divisors (see below), whose sum is σ = 734640016. Its totient is φ = 550980000.

The previous prime is 642809987. The next prime is 642810019. The reversal of 642810007 is 700018246.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 642810007 - 2¹⁹ = 642285719 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (642810407) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 45914994 + ... + 45915007.

It is an arithmetic number, because the mean of its divisors is an integer number (183660004).

Almost surely, 2^642810007 is an apocalyptic number.

642810007 is a deficient number, since it is larger than the sum of its proper divisors (91830009).

642810007 is an equidigital number, since it uses as much as digits as its factorization.

642810007 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 91830008.

The product of its (nonzero) digits is 2688, while the sum is 28.

The square root of 642810007 is about 25353.6980931776. The cubic root of 642810007 is about 863.0332797295.

The spelling of 642810007 in words is "six hundred forty-two million, eight hundred ten thousand, seven".