642215230 has 16 divisors (see below), whose sum is σ = 1156602240. Its totient is φ = 256749472.

The previous prime is 642215221. The next prime is 642215243. The reversal of 642215230 is 32512246.

It is a junction number, because it is equal to n+sod(n) for n = 642215195 and 642215204.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3891 + ... + 36049.

It is an arithmetic number, because the mean of its divisors is an integer number (72287640).

Almost surely, 2^642215230 is an apocalyptic number.

642215230 is a deficient number, since it is larger than the sum of its proper divisors (514387010).

642215230 is a wasteful number, since it uses less digits than its factorization.

642215230 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34163.

The product of its (nonzero) digits is 2880, while the sum is 25.

The square root of 642215230 is about 25341.9657879968. The cubic root of 642215230 is about 862.7670161163.

Adding to 642215230 its reverse (32512246), we get a palindrome (674727476).

The spelling of 642215230 in words is "six hundred forty-two million, two hundred fifteen thousand, two hundred thirty".