642205330 has 32 divisors (see below), whose sum is σ = 1252569024. Its totient is φ = 235659456.

The previous prime is 642205313. The next prime is 642205351. The reversal of 642205330 is 33502246.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 642205295 and 642205304.

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 15 ways as a sum of consecutive naturals, for example, 6037 + ... + 36343.

It is an arithmetic number, because the mean of its divisors is an integer number (39142782).

Almost surely, 2^642205330 is an apocalyptic number.

642205330 is a deficient number, since it is larger than the sum of its proper divisors (610363694).

642205330 is a wasteful number, since it uses less digits than its factorization.

642205330 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30490.

The product of its (nonzero) digits is 4320, while the sum is 25.

The square root of 642205330 is about 25341.7704590662. The cubic root of 642205330 is about 862.7625827961.

Adding to 642205330 its reverse (33502246), we get a palindrome (675707576).

The spelling of 642205330 in words is "six hundred forty-two million, two hundred five thousand, three hundred thirty".