642442004 has 12 divisors (see below), whose sum is σ = 1125081300. Its totient is φ = 320990208.

The previous prime is 642441977. The next prime is 642442037. The reversal of 642442004 is 400244246.

It can be written as a sum of positive squares in 2 ways, for example, as 277555600 + 364886404 = 16660^2 + 19102^2 .

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 51359 + ... + 62630.

It is an arithmetic number, because the mean of its divisors is an integer number (93756775).

Almost surely, 2^642442004 is an apocalyptic number.

It is an amenable number.

642442004 is a deficient number, since it is larger than the sum of its proper divisors (482639296).

642442004 is a wasteful number, since it uses less digits than its factorization.

642442004 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 115402 (or 115400 counting only the distinct ones).

The product of its (nonzero) digits is 6144, while the sum is 26.

The square root of 642442004 is about 25346.4396710860. The cubic root of 642442004 is about 862.8685553374.

The spelling of 642442004 in words is "six hundred forty-two million, four hundred forty-two thousand, four".