646647605 has 16 divisors (see below), whose sum is σ = 787207680. Its totient is φ = 509861568.

The previous prime is 646647587. The next prime is 646647607. The reversal of 646647605 is 506746646.

646647605 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 646647605 - 2¹⁴ = 646631221 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (646647607) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 197159 + ... + 200411.

It is an arithmetic number, because the mean of its divisors is an integer number (49200480).

Almost surely, 2^646647605 is an apocalyptic number.

It is an amenable number.

646647605 is a deficient number, since it is larger than the sum of its proper divisors (140560075).

646647605 is a wasteful number, since it uses less digits than its factorization.

646647605 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3820.

The product of its (nonzero) digits is 725760, while the sum is 44.

The square root of 646647605 is about 25429.2667019716. The cubic root of 646647605 is about 864.7473194703.

The spelling of 646647605 in words is "six hundred forty-six million, six hundred forty-seven thousand, six hundred five".