1644625368 has 48 divisors (see below), whose sum is σ = 4478838000. Its totient is φ = 545175360.

The previous prime is 1644625357. The next prime is 1644625369. The reversal of 1644625368 is 8635264461.

1644625368 is a `hidden beast` number, since 16 + 4 + 4 + 625 + 3 + 6 + 8 = 666.

1644625368 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1644625369) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 50068 + ... + 76131.

It is an arithmetic number, because the mean of its divisors is an integer number (93309125).

Almost surely, 2^1644625368 is an apocalyptic number.

1644625368 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

1644625368 is an abundant number, since it is smaller than the sum of its proper divisors (2834212632).

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

1644625368 is a wasteful number, since it uses less digits than its factorization.

1644625368 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 126392 (or 126385 counting only the distinct ones).

The product of its digits is 829440, while the sum is 45.

The square root of 1644625368 is about 40553.9809143319. The cubic root of 1644625368 is about 1180.3813207912.

It can be divided in two parts, 16446 and 25368, that added together give a palindrome (41814).

The spelling of 1644625368 in words is "one billion, six hundred forty-four million, six hundred twenty-five thousand, three hundred sixty-eight".