1645774328 has 32 divisors (see below), whose sum is σ = 3378827520. Its totient is φ = 745308000.

The previous prime is 1645774321. The next prime is 1645774343. The reversal of 1645774328 is 8234775461.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1645774321) 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, 10658 + ... + 58353.

It is an arithmetic number, because the mean of its divisors is an integer number (105588360).

Almost surely, 2^1645774328 is an apocalyptic number.

It is an amenable number.

1645774328 is an abundant number, since it is smaller than the sum of its proper divisors (1733053192).

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

1645774328 is a wasteful number, since it uses less digits than its factorization.

1645774328 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 69299 (or 69295 counting only the distinct ones).

The product of its digits is 1128960, while the sum is 47.

The square root of 1645774328 is about 40568.1442513704. The cubic root of 1645774328 is about 1180.6561341819.

The spelling of 1645774328 in words is "one billion, six hundred forty-five million, seven hundred seventy-four thousand, three hundred twenty-eight".