642342520 has 16 divisors (see below), whose sum is σ = 1445270760. Its totient is φ = 256936992.

The previous prime is 642342497. The next prime is 642342523. The reversal of 642342520 is 25243246.

642342520 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (642342523) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8029242 + ... + 8029321.

Almost surely, 2^642342520 is an apocalyptic number.

It is an amenable number.

642342520 is an abundant number, since it is smaller than the sum of its proper divisors (802928240).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

642342520 is a wasteful number, since it uses less digits than its factorization.

642342520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16058574 (or 16058570 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 28.

The square root of 642342520 is about 25344.4771104081. The cubic root of 642342520 is about 862.8240138088.

Adding to 642342520 its reverse (25243246), we get a palindrome (667585766).

The spelling of 642342520 in words is "six hundred forty-two million, three hundred forty-two thousand, five hundred twenty".