1644001362 has 48 divisors (see below), whose sum is σ = 3737260800. Its totient is φ = 521618400.

The previous prime is 1644001361. The next prime is 1644001397. The reversal of 1644001362 is 2631004461.

1644001362 is a `hidden beast` number, since 1 + 644 + 0 + 0 + 13 + 6 + 2 = 666.

It is not an unprimeable number, because it can be changed into a prime (1644001361) by changing a digit.

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 23 ways as a sum of consecutive naturals, for example, 9889 + ... + 58187.

It is an arithmetic number, because the mean of its divisors is an integer number (77859600).

Almost surely, 2^1644001362 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1644001362, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1868630400).

1644001362 is an abundant number, since it is smaller than the sum of its proper divisors (2093259438).

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

1644001362 is a wasteful number, since it uses less digits than its factorization.

1644001362 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48399 (or 48396 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 27.

The square root of 1644001362 is about 40546.2866610495. The cubic root of 1644001362 is about 1180.2320146094.

The spelling of 1644001362 in words is "one billion, six hundred forty-four million, one thousand, three hundred sixty-two".