642626308 has 6 divisors (see below), whose sum is σ = 1124596046. Its totient is φ = 321313152.

The previous prime is 642626297. The next prime is 642626321. The reversal of 642626308 is 803626246.

It can be written as a sum of positive squares in only one way, i.e., 440076484 + 202549824 = 20978^2 + 14232^2 .

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 as a sum of consecutive naturals, namely, 80328285 + ... + 80328292.

Almost surely, 2^642626308 is an apocalyptic number.

It is an amenable number.

642626308 is a deficient number, since it is larger than the sum of its proper divisors (481969738).

642626308 is a wasteful number, since it uses less digits than its factorization.

642626308 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 160656581 (or 160656579 counting only the distinct ones).

The product of its (nonzero) digits is 82944, while the sum is 37.

The square root of 642626308 is about 25350.0751083700. The cubic root of 642626308 is about 862.9510607984.

The spelling of 642626308 in words is "six hundred forty-two million, six hundred twenty-six thousand, three hundred eight".