646930540 has 12 divisors (see below), whose sum is σ = 1358554176. Its totient is φ = 258772208.

The previous prime is 646930489. The next prime is 646930541. The reversal of 646930540 is 45039646.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 646930540.

It is not an unprimeable number, because it can be changed into a prime (646930541) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16173244 + ... + 16173283.

It is an arithmetic number, because the mean of its divisors is an integer number (113212848).

Almost surely, 2^646930540 is an apocalyptic number.

It is an amenable number.

646930540 is an abundant number, since it is smaller than the sum of its proper divisors (711623636).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

646930540 is a wasteful number, since it uses less digits than its factorization.

646930540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32346536 (or 32346534 counting only the distinct ones).

The product of its (nonzero) digits is 77760, while the sum is 37.

The square root of 646930540 is about 25434.8292701170. The cubic root of 646930540 is about 864.8734219542.

The spelling of 646930540 in words is "six hundred forty-six million, nine hundred thirty thousand, five hundred forty".