643635342 has 32 divisors (see below), whose sum is σ = 1634630400. Its totient is φ = 183895704.

The previous prime is 643635341. The next prime is 643635353. The reversal of 643635342 is 243536346.

643635342 is a `hidden beast` number, since 64 + 3 + 63 + 534 + 2 = 666.

It is a junction number, because it is equal to n+sod(n) for n = 643635297 and 643635306.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (643635341) 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, 850992 + ... + 851747.

It is an arithmetic number, because the mean of its divisors is an integer number (51082200).

Almost surely, 2^643635342 is an apocalyptic number.

643635342 is an abundant number, since it is smaller than the sum of its proper divisors (990995058).

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

643635342 is a wasteful number, since it uses less digits than its factorization.

643635342 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1702757 (or 1702751 counting only the distinct ones).

The product of its digits is 155520, while the sum is 36.

The square root of 643635342 is about 25369.9692944237. The cubic root of 643635342 is about 863.4024852142.

The spelling of 643635342 in words is "six hundred forty-three million, six hundred thirty-five thousand, three hundred forty-two".