646347042 has 96 divisors (see below), whose sum is σ = 1582229376. Its totient is φ = 188985600.

The previous prime is 646347019. The next prime is 646347071. The reversal of 646347042 is 240743646.

646347042 is a `hidden beast` number, since 646 + 3 + 4 + 7 + 0 + 4 + 2 = 666.

It is a Smith number, since the sum of its digits (36) 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 = 646346988 and 646347006.

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 in 47 ways as a sum of consecutive naturals, for example, 835768 + ... + 836540.

It is an arithmetic number, because the mean of its divisors is an integer number (16481556).

Almost surely, 2^646347042 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 646347042, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (791114688).

646347042 is an abundant number, since it is smaller than the sum of its proper divisors (935882334).

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

646347042 is a wasteful number, since it uses less digits than its factorization.

646347042 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 936 (or 933 counting only the distinct ones).

The product of its (nonzero) digits is 96768, while the sum is 36.

The square root of 646347042 is about 25423.3562300496. The cubic root of 646347042 is about 864.6133199905.

The spelling of 646347042 in words is "six hundred forty-six million, three hundred forty-seven thousand, forty-two".