1645330304 has 64 divisors (see below), whose sum is σ = 3355363440. Its totient is φ = 803352576.

The previous prime is 1645330249. The next prime is 1645330307. The reversal of 1645330304 is 4030335461.

It is a tau number, because it is divible by the number of its divisors (64).

It is a super-2 number, since 2×1645330304² = 5414223618521464832, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1645330307) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1919444 + ... + 1920300.

Almost surely, 2^1645330304 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1645330304, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1677681720).

1645330304 is an abundant number, since it is smaller than the sum of its proper divisors (1710033136).

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

1645330304 is an equidigital number, since it uses as much as digits as its factorization.

1645330304 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1207 (or 1195 counting only the distinct ones).

The product of its (nonzero) digits is 12960, while the sum is 29.

The square root of 1645330304 is about 40562.6713124271. The cubic root of 1645330304 is about 1180.5499457041.

Adding to 1645330304 its reverse (4030335461), we get a palindrome (5675665765).

The spelling of 1645330304 in words is "one billion, six hundred forty-five million, three hundred thirty thousand, three hundred four".