642305253 has 8 divisors (see below), whose sum is σ = 885938400. Its totient is φ = 413437808.

The previous prime is 642305207. The next prime is 642305267. The reversal of 642305253 is 352503246.

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 642305253 - 2¹⁸ = 642043109 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 642305253.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (642305453) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3691323 + ... + 3691496.

It is an arithmetic number, because the mean of its divisors is an integer number (110742300).

Almost surely, 2^642305253 is an apocalyptic number.

It is an amenable number.

642305253 is a deficient number, since it is larger than the sum of its proper divisors (243633147).

642305253 is a wasteful number, since it uses less digits than its factorization.

642305253 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7382851.

The product of its (nonzero) digits is 21600, while the sum is 30.

The square root of 642305253 is about 25343.7418902576. The cubic root of 642305253 is about 862.8073272367.

Adding to 642305253 its reverse (352503246), we get a palindrome (994808499).

The spelling of 642305253 in words is "six hundred forty-two million, three hundred five thousand, two hundred fifty-three".