646630207 has 4 divisors (see below), whose sum is σ = 684667296. Its totient is φ = 608593120.

The previous prime is 646630181. The next prime is 646630223. The reversal of 646630207 is 702036646.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 702036646 = 2 ⋅351018323.

It is a cyclic number.

It is not a de Polignac number, because 646630207 - 2⁷ = 646630079 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 (646630297) 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 3 ways as a sum of consecutive naturals, for example, 19018519 + ... + 19018552.

It is an arithmetic number, because the mean of its divisors is an integer number (171166824).

Almost surely, 2^646630207 is an apocalyptic number.

646630207 is a deficient number, since it is larger than the sum of its proper divisors (38037089).

646630207 is a wasteful number, since it uses less digits than its factorization.

646630207 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38037088.

The product of its (nonzero) digits is 36288, while the sum is 34.

The square root of 646630207 is about 25428.9246135184. The cubic root of 646630207 is about 864.7395640825.

The spelling of 646630207 in words is "six hundred forty-six million, six hundred thirty thousand, two hundred seven".