1644328 has 16 divisors (see below), whose sum is σ = 3523680. Its totient is φ = 704688.

The previous prime is 1644311. The next prime is 1644341. The reversal of 1644328 is 8234461.

It is a super-3 number, since 3×1644328³ = 13337874020590726656, which contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (28).

It is a junction number, because it is equal to n+sod(n) for n = 1644296 and 1644305.

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, 14626 + ... + 14737.

It is an arithmetic number, because the mean of its divisors is an integer number (220230).

2^1644328 is an apocalyptic number.

It is an amenable number.

1644328 is an abundant number, since it is smaller than the sum of its proper divisors (1879352).

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

1644328 is a wasteful number, since it uses less digits than its factorization.

1644328 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29376 (or 29372 counting only the distinct ones).

The product of its digits is 4608, while the sum is 28.

The square root of 1644328 is about 1282.3135342029. The cubic root of 1644328 is about 118.0310174134.

Adding to 1644328 its reverse (8234461), we get a palindrome (9878789).

It can be divided in two parts, 16443 and 28, that added together give a triangular number (16471 = T₁₈₁).

The spelling of 1644328 in words is "one million, six hundred forty-four thousand, three hundred twenty-eight".