1644672632 has 16 divisors (see below), whose sum is σ = 3090636000. Its totient is φ = 820503040.

The previous prime is 1644672571. The next prime is 1644672703. The reversal of 1644672632 is 2362764461.

It is a self number, because there is not a number n which added to its sum of digits gives 1644672632.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 225344 + ... + 232527.

It is an arithmetic number, because the mean of its divisors is an integer number (193164750).

Almost surely, 2^1644672632 is an apocalyptic number.

It is an amenable number.

1644672632 is a deficient number, since it is larger than the sum of its proper divisors (1445963368).

1644672632 is a wasteful number, since it uses less digits than its factorization.

1644672632 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 458326 (or 458322 counting only the distinct ones).

The product of its digits is 290304, while the sum is 41.

The square root of 1644672632 is about 40554.5636396201. The cubic root of 1644672632 is about 1180.3926281299.

The spelling of 1644672632 in words is "one billion, six hundred forty-four million, six hundred seventy-two thousand, six hundred thirty-two".