646858542 has 32 divisors (see below), whose sum is σ = 1412835840. Its totient is φ = 195808320.

The previous prime is 646858469. The next prime is 646858609. The reversal of 646858542 is 245858646.

646858542 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a junction number, because it is equal to n+sod(n) for n = 646858491 and 646858500.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 63858 + ... + 73290.

It is an arithmetic number, because the mean of its divisors is an integer number (44151120).

Almost surely, 2^646858542 is an apocalyptic number.

646858542 is an abundant number, since it is smaller than the sum of its proper divisors (765977298).

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

646858542 is a wasteful number, since it uses less digits than its factorization.

646858542 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10488.

The product of its digits is 1843200, while the sum is 48.

The square root of 646858542 is about 25433.4138880332. The cubic root of 646858542 is about 864.8413363525.

The spelling of 646858542 in words is "six hundred forty-six million, eight hundred fifty-eight thousand, five hundred forty-two".