646885900 has 36 divisors (see below), whose sum is σ = 1406324920. Its totient is φ = 258278400.

The previous prime is 646885873. The next prime is 646885901. The reversal of 646885900 is 9588646.

It is a super-2 number, since 2×646885900² = 836922735237620000, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (646885901) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 51436 + ... + 62764.

Almost surely, 2^646885900 is an apocalyptic number.

It is an amenable number.

646885900 is an abundant number, since it is smaller than the sum of its proper divisors (759439020).

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

646885900 is a wasteful number, since it uses less digits than its factorization.

646885900 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11914 (or 11907 counting only the distinct ones).

The product of its (nonzero) digits is 414720, while the sum is 46.

The square root of 646885900 is about 25433.9517181267. The cubic root of 646885900 is about 864.8535286090.

The spelling of 646885900 in words is "six hundred forty-six million, eight hundred eighty-five thousand, nine hundred".