646410047 has 4 divisors (see below), whose sum is σ = 667262016. Its totient is φ = 625558080.

The previous prime is 646410019. The next prime is 646410097. The reversal of 646410047 is 740014646.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 646410047 - 2¹² = 646405951 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 646409995 and 646410022.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (646410007) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10425938 + ... + 10425999.

It is an arithmetic number, because the mean of its divisors is an integer number (166815504).

Almost surely, 2^646410047 is an apocalyptic number.

646410047 is a deficient number, since it is larger than the sum of its proper divisors (20851969).

646410047 is a wasteful number, since it uses less digits than its factorization.

646410047 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20851968.

The product of its (nonzero) digits is 16128, while the sum is 32.

The square root of 646410047 is about 25424.5953163467. The cubic root of 646410047 is about 864.6414128409.

The spelling of 646410047 in words is "six hundred forty-six million, four hundred ten thousand, forty-seven".