646540630 has 16 divisors (see below), whose sum is σ = 1165583520. Its totient is φ = 258213952.

The previous prime is 646540621. The next prime is 646540637. The reversal of 646540630 is 36045646.

646540630 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (646540637) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 43495 + ... + 56434.

It is an arithmetic number, because the mean of its divisors is an integer number (72848970).

Almost surely, 2^646540630 is an apocalyptic number.

646540630 is a deficient number, since it is larger than the sum of its proper divisors (519042890).

646540630 is a wasteful number, since it uses less digits than its factorization.

646540630 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 100583.

The product of its (nonzero) digits is 51840, while the sum is 34.

The square root of 646540630 is about 25427.1632314735. The cubic root of 646540630 is about 864.6996317522.

The spelling of 646540630 in words is "six hundred forty-six million, five hundred forty thousand, six hundred thirty".