1645342328 has 64 divisors (see below), whose sum is σ = 3589402560. Its totient is φ = 692499456.

The previous prime is 1645342271. The next prime is 1645342333. The reversal of 1645342328 is 8232435461.

It is a junction number, because it is equal to n+sod(n) for n = 1645342291 and 1645342300.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1131650 + ... + 1133102.

It is an arithmetic number, because the mean of its divisors is an integer number (56084415).

Almost surely, 2^1645342328 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 1645342328, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1794701280).

1645342328 is an abundant number, since it is smaller than the sum of its proper divisors (1944060232).

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

1645342328 is a wasteful number, since it uses less digits than its factorization.

1645342328 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1816 (or 1812 counting only the distinct ones).

The product of its digits is 138240, while the sum is 38.

The square root of 1645342328 is about 40562.8195272469. The cubic root of 1645342328 is about 1180.5528214991.

Adding to 1645342328 its reverse (8232435461), we get a palindrome (9877777789).

The spelling of 1645342328 in words is "one billion, six hundred forty-five million, three hundred forty-two thousand, three hundred twenty-eight".