642330064 has 20 divisors (see below), whose sum is σ = 1278151204. Its totient is φ = 312484608.

The previous prime is 642330053. The next prime is 642330083. The reversal of 642330064 is 460033246.

It can be written as a sum of positive squares in 2 ways, for example, as 556582464 + 85747600 = 23592^2 + 9260^2 .

It is a super-2 number, since 2×642330064² = 825175822236488192, which contains 22 as substring.

It is a congruent number.

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 3 ways as a sum of consecutive naturals, for example, 541917 + ... + 543100.

Almost surely, 2^642330064 is an apocalyptic number.

It is an amenable number.

642330064 is a deficient number, since it is larger than the sum of its proper divisors (635821140).

642330064 is a wasteful number, since it uses less digits than its factorization.

642330064 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1085062 (or 1085056 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 28.

The square root of 642330064 is about 25344.2313752065. The cubic root of 642330064 is about 862.8184366154.

The spelling of 642330064 in words is "six hundred forty-two million, three hundred thirty thousand, sixty-four".