1643327604 has 36 divisors (see below), whose sum is σ = 4184300484. Its totient is φ = 543775872.

The previous prime is 1643327597. The next prime is 1643327629. The reversal of 1643327604 is 4067233461.

It is a happy number.

1643327604 is a `hidden beast` number, since 1 + 6 + 43 + 3 + 2 + 7 + 604 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 1326416400 + 316911204 = 36420^2 + 17802^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is a super-2 number, since 2×1643327604² = 5401051228136761632, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 161667 + ... + 171530.

It is an arithmetic number, because the mean of its divisors is an integer number (116230569).

Almost surely, 2^1643327604 is an apocalyptic number.

It is an amenable number.

1643327604 is an abundant number, since it is smaller than the sum of its proper divisors (2540972880).

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

1643327604 is a wasteful number, since it uses less digits than its factorization.

1643327604 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 333344 (or 333339 counting only the distinct ones).

The product of its (nonzero) digits is 72576, while the sum is 36.

The square root of 1643327604 is about 40537.9773052381. The cubic root of 1643327604 is about 1180.0707618199.

The spelling of 1643327604 in words is "one billion, six hundred forty-three million, three hundred twenty-seven thousand, six hundred four".