642967852 has 48 divisors (see below), whose sum is σ = 1194439680. Its totient is φ = 302239872.

The previous prime is 642967841. The next prime is 642967859. The reversal of 642967852 is 258769246.

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 642967796 and 642967805.

It is not an unprimeable number, because it can be changed into a prime (642967859) 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, 1751773 + ... + 1752139.

It is an arithmetic number, because the mean of its divisors is an integer number (24884160).

Almost surely, 2^642967852 is an apocalyptic number.

It is an amenable number.

642967852 is a deficient number, since it is larger than the sum of its proper divisors (551471828).

642967852 is a wasteful number, since it uses less digits than its factorization.

642967852 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 670 (or 668 counting only the distinct ones).

The product of its digits is 1451520, while the sum is 49.

The square root of 642967852 is about 25356.8107616080. The cubic root of 642967852 is about 863.1039145660.

The spelling of 642967852 in words is "six hundred forty-two million, nine hundred sixty-seven thousand, eight hundred fifty-two".