1664001408 has 32 divisors (see below), whose sum is σ = 4420004760. Its totient is φ = 554667008.

The previous prime is 1664001397. The next prime is 1664001439. The reversal of 1664001408 is 8041004661.

It is a tau number, because it is divible by the number of its divisors (32).

It is a congruent number.

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, 2166285 + ... + 2167052.

Almost surely, 2^1664001408 is an apocalyptic number.

It is an amenable number.

1664001408 is an abundant number, since it is smaller than the sum of its proper divisors (2756003352).

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

1664001408 is an equidigital number, since it uses as much as digits as its factorization.

1664001408 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4333354 (or 4333342 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 30.

The square root of 1664001408 is about 40792.1733669585. The cubic root of 1664001408 is about 1184.9987615932.

The spelling of 1664001408 in words is "one billion, six hundred sixty-four million, one thousand, four hundred eight".