642245005 has 8 divisors (see below), whose sum is σ = 771435000. Its totient is φ = 513302016.

The previous prime is 642244943. The next prime is 642245053. The reversal of 642245005 is 500542246.

642245005 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 40475044 + 601769961 = 6362^2 + 24531^2 .

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 642245005 - 2⁷ = 642244877 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 55980 + ... + 66469.

It is an arithmetic number, because the mean of its divisors is an integer number (96429375).

Almost surely, 2^642245005 is an apocalyptic number.

It is an amenable number.

642245005 is a deficient number, since it is larger than the sum of its proper divisors (129189995).

642245005 is a wasteful number, since it uses less digits than its factorization.

642245005 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 123503.

The product of its (nonzero) digits is 9600, while the sum is 28.

The square root of 642245005 is about 25342.5532454802. The cubic root of 642245005 is about 862.7803493883.

The spelling of 642245005 in words is "six hundred forty-two million, two hundred forty-five thousand, five".