1664327500 has 60 divisors (see below), whose sum is σ = 3970485288. Its totient is φ = 605200000.

The previous prime is 1664327491. The next prime is 1664327563. The reversal of 1664327500 is 57234661.

It is a happy number.

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 19 ways as a sum of consecutive naturals, for example, 2761 + ... + 57760.

Almost surely, 2^1664327500 is an apocalyptic number.

1664327500 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1664327500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1985242644).

1664327500 is an abundant number, since it is smaller than the sum of its proper divisors (2306157788).

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

1664327500 is a wasteful number, since it uses less digits than its factorization.

1664327500 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 60556 (or 60539 counting only the distinct ones).

The product of its (nonzero) digits is 30240, while the sum is 34.

The square root of 1664327500 is about 40796.1701633867. The cubic root of 1664327500 is about 1185.0761640471.

The spelling of 1664327500 in words is "one billion, six hundred sixty-four million, three hundred twenty-seven thousand, five hundred".