642553330 has 16 divisors (see below), whose sum is σ = 1158113880. Its totient is φ = 256684032.

The previous prime is 642553279. The next prime is 642553339. The reversal of 642553330 is 33355246.

It is a happy number.

642553330 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 628855929 + 13697401 = 25077^2 + 3701^2 .

It is a junction number, because it is equal to n+sod(n) for n = 642553292 and 642553301.

It is not an unprimeable number, because it can be changed into a prime (642553339) 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, 34089 + ... + 49468.

Almost surely, 2^642553330 is an apocalyptic number.

642553330 is a deficient number, since it is larger than the sum of its proper divisors (515560550).

642553330 is a wasteful number, since it uses less digits than its factorization.

642553330 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 84333.

The product of its (nonzero) digits is 32400, while the sum is 31.

The square root of 642553330 is about 25348.6356634830. The cubic root of 642553330 is about 862.9183933805.

The spelling of 642553330 in words is "six hundred forty-two million, five hundred fifty-three thousand, three hundred thirty".