646550188 has 12 divisors (see below), whose sum is σ = 1198019592. Its totient is φ = 304258880.

The previous prime is 646550161. The next prime is 646550213. The reversal of 646550188 is 881055646.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 4753978 + ... + 4754113.

It is an arithmetic number, because the mean of its divisors is an integer number (99834966).

Almost surely, 2^646550188 is an apocalyptic number.

646550188 is a gapful number since it is divisible by the number (68) formed by its first and last digit.

It is an amenable number.

646550188 is a deficient number, since it is larger than the sum of its proper divisors (551469404).

646550188 is a wasteful number, since it uses less digits than its factorization.

646550188 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9508112 (or 9508110 counting only the distinct ones).

The product of its (nonzero) digits is 230400, while the sum is 43.

The square root of 646550188 is about 25427.3511793895. The cubic root of 646550188 is about 864.7038927674.

The spelling of 646550188 in words is "six hundred forty-six million, five hundred fifty thousand, one hundred eighty-eight".