642406832 has 10 divisors (see below), whose sum is σ = 1244663268. Its totient is φ = 321203408.

The previous prime is 642406801. The next prime is 642406841. The reversal of 642406832 is 238604246.

It is a junction number, because it is equal to n+sod(n) for n = 642406792 and 642406801.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20075198 + ... + 20075229.

Almost surely, 2^642406832 is an apocalyptic number.

It is an amenable number.

642406832 is a deficient number, since it is larger than the sum of its proper divisors (602256436).

642406832 is a wasteful number, since it uses less digits than its factorization.

642406832 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40150435 (or 40150429 counting only the distinct ones).

The product of its (nonzero) digits is 55296, while the sum is 35.

The square root of 642406832 is about 25345.7458363332. The cubic root of 642406832 is about 862.8528084599.

The spelling of 642406832 in words is "six hundred forty-two million, four hundred six thousand, eight hundred thirty-two".