642442005 has 12 divisors (see below), whose sum is σ = 1113566220. Its totient is φ = 342635712.

The previous prime is 642441977. The next prime is 642442037. The reversal of 642442005 is 500244246.

It can be written as a sum of positive squares in 2 ways, for example, as 69605649 + 572836356 = 8343^2 + 23934^2 .

It is not a de Polignac number, because 642442005 - 2¹¹ = 642439957 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 642442005.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 7138200 + ... + 7138289.

It is an arithmetic number, because the mean of its divisors is an integer number (92797185).

Almost surely, 2^642442005 is an apocalyptic number.

It is an amenable number.

642442005 is a deficient number, since it is larger than the sum of its proper divisors (471124215).

642442005 is a wasteful number, since it uses less digits than its factorization.

642442005 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14276500 (or 14276497 counting only the distinct ones).

The product of its (nonzero) digits is 7680, while the sum is 27.

The square root of 642442005 is about 25346.4396908126. The cubic root of 642442005 is about 862.8685557851.

The spelling of 642442005 in words is "six hundred forty-two million, four hundred forty-two thousand, five".