646484641 has 4 divisors (see below), whose sum is σ = 705255984. Its totient is φ = 587713300.

The previous prime is 646484611. The next prime is 646484659. The reversal of 646484641 is 146484646.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 646484641 - 2⁹ = 646484129 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (646484611) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 29385655 + ... + 29385676.

It is an arithmetic number, because the mean of its divisors is an integer number (176313996).

Almost surely, 2^646484641 is an apocalyptic number.

It is an amenable number.

646484641 is a deficient number, since it is larger than the sum of its proper divisors (58771343).

646484641 is a wasteful number, since it uses less digits than its factorization.

646484641 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 58771342.

The product of its digits is 442368, while the sum is 43.

The square root of 646484641 is about 25426.0622393638. The cubic root of 646484641 is about 864.6746706680.

The spelling of 646484641 in words is "six hundred forty-six million, four hundred eighty-four thousand, six hundred forty-one".