1644445162 has 8 divisors (see below), whose sum is σ = 2468895300. Its totient is φ = 821480064.

The previous prime is 1644445141. The next prime is 1644445247. The reversal of 1644445162 is 2615444461.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 1067917041 + 576528121 = 32679^2 + 24011^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

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, 368487 + ... + 372922.

Almost surely, 2^1644445162 is an apocalyptic number.

1644445162 is a deficient number, since it is larger than the sum of its proper divisors (824450138).

1644445162 is a wasteful number, since it uses less digits than its factorization.

1644445162 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 742520.

The product of its digits is 92160, while the sum is 37.

The square root of 1644445162 is about 40551.7590493927. The cubic root of 1644445162 is about 1180.3382067037.

The spelling of 1644445162 in words is "one billion, six hundred forty-four million, four hundred forty-five thousand, one hundred sixty-two".