1640529168 has 80 divisors (see below), whose sum is σ = 4340793600. Its totient is φ = 533744640.

The previous prime is 1640529151. The next prime is 1640529173. The reversal of 1640529168 is 8619250461.

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 15 ways as a sum of consecutive naturals, for example, 335058 + ... + 339918.

It is an arithmetic number, because the mean of its divisors is an integer number (54259920).

Almost surely, 2^1640529168 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1640529168, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2170396800).

1640529168 is an abundant number, since it is smaller than the sum of its proper divisors (2700264432).

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

1640529168 is a wasteful number, since it uses less digits than its factorization.

1640529168 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5040 (or 5034 counting only the distinct ones).

The product of its (nonzero) digits is 103680, while the sum is 42.

The square root of 1640529168 is about 40503.4463718830. The cubic root of 1640529168 is about 1179.4005305152.

The spelling of 1640529168 in words is "one billion, six hundred forty million, five hundred twenty-nine thousand, one hundred sixty-eight".