642033613 has 16 divisors (see below), whose sum is σ = 703589040. Its totient is φ = 582280704.

The previous prime is 642033589. The next prime is 642033619. The reversal of 642033613 is 316330246.

642033613 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 8 ways, for example, as 55086084 + 586947529 = 7422^2 + 24227^2 .

It is a de Polignac number, because none of the positive numbers 2^k-642033613 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (642033619) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 276903 + ... + 279211.

It is an arithmetic number, because the mean of its divisors is an integer number (43974315).

Almost surely, 2^642033613 is an apocalyptic number.

It is an amenable number.

642033613 is a deficient number, since it is larger than the sum of its proper divisors (61555427).

642033613 is a wasteful number, since it uses less digits than its factorization.

642033613 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2688.

The product of its (nonzero) digits is 7776, while the sum is 28.

The square root of 642033613 is about 25338.3822096045. The cubic root of 642033613 is about 862.6856789348.

Adding to 642033613 its reverse (316330246), we get a palindrome (958363859).

The spelling of 642033613 in words is "six hundred forty-two million, thirty-three thousand, six hundred thirteen".