642303245 has 4 divisors (see below), whose sum is σ = 770763900. Its totient is φ = 513842592.

The previous prime is 642303241. The next prime is 642303247. The reversal of 642303245 is 542303246.

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

It can be written as a sum of positive squares in 2 ways, for example, as 338044996 + 304258249 = 18386^2 + 17443^2 .

It is a cyclic number.

It is not a de Polignac number, because 642303245 - 2² = 642303241 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (642303241) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 64230320 + ... + 64230329.

It is an arithmetic number, because the mean of its divisors is an integer number (192690975).

Almost surely, 2^642303245 is an apocalyptic number.

It is an amenable number.

642303245 is a deficient number, since it is larger than the sum of its proper divisors (128460655).

642303245 is a wasteful number, since it uses less digits than its factorization.

642303245 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 128460654.

The product of its (nonzero) digits is 17280, while the sum is 29.

The square root of 642303245 is about 25343.7022749242. The cubic root of 642303245 is about 862.8064281217.

Subtracting from 642303245 its reverse (542303246), we obtain a palindrome (99999999).

The spelling of 642303245 in words is "six hundred forty-two million, three hundred three thousand, two hundred forty-five".