1644625332 has 72 divisors (see below), whose sum is σ = 5001214400. Its totient is φ = 445160448.

The previous prime is 1644625303. The next prime is 1644625357. The reversal of 1644625332 is 2335264461.

1644625332 is a `hidden beast` number, since 1 + 64 + 4 + 62 + 533 + 2 = 666.

1644625332 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×1644625332² = 5409584965312220448, 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 23 ways as a sum of consecutive naturals, for example, 166957 + ... + 176532.

Almost surely, 2^1644625332 is an apocalyptic number.

1644625332 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1644625332 is an abundant number, since it is smaller than the sum of its proper divisors (3356589068).

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

1644625332 is a wasteful number, since it uses less digits than its factorization.

1644625332 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 343525 (or 343520 counting only the distinct ones).

The product of its digits is 103680, while the sum is 36.

The square root of 1644625332 is about 40553.9804704791. The cubic root of 1644625332 is about 1180.3813121785.

Adding to 1644625332 its reverse (2335264461), we get a palindrome (3979889793).

The spelling of 1644625332 in words is "one billion, six hundred forty-four million, six hundred twenty-five thousand, three hundred thirty-two".