646706005 has 16 divisors (see below), whose sum is σ = 851503104. Its totient is φ = 467606080.

The previous prime is 646705991. The next prime is 646706009. The reversal of 646706005 is 500607646.

It is not a de Polignac number, because 646706005 - 2¹¹ = 646703957 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (646706009) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 24469 + ... + 43498.

It is an arithmetic number, because the mean of its divisors is an integer number (53218944).

Almost surely, 2^646706005 is an apocalyptic number.

It is an amenable number.

646706005 is a deficient number, since it is larger than the sum of its proper divisors (204797099).

646706005 is a wasteful number, since it uses less digits than its factorization.

646706005 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 68156.

The product of its (nonzero) digits is 30240, while the sum is 34.

The square root of 646706005 is about 25430.4149592570. The cubic root of 646706005 is about 864.7733510228.

The spelling of 646706005 in words is "six hundred forty-six million, seven hundred six thousand, five".