1640950188 has 12 divisors (see below), whose sum is σ = 3828883800. Its totient is φ = 546983392.

The previous prime is 1640950139. The next prime is 1640950229. The reversal of 1640950188 is 8810590461.

It is a tau number, because it is divible by the number of its divisors (12).

It is an unprimeable number.

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, 68372913 + ... + 68372936.

It is an arithmetic number, because the mean of its divisors is an integer number (319073650).

Almost surely, 2^1640950188 is an apocalyptic number.

It is an amenable number.

1640950188 is an abundant number, since it is smaller than the sum of its proper divisors (2187933612).

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

1640950188 is a wasteful number, since it uses less digits than its factorization.

1640950188 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 136745856 (or 136745854 counting only the distinct ones).

The product of its (nonzero) digits is 69120, while the sum is 42.

The square root of 1640950188 is about 40508.6433739764. The cubic root of 1640950188 is about 1179.5014143742.

The spelling of 1640950188 in words is "one billion, six hundred forty million, nine hundred fifty thousand, one hundred eighty-eight".