1645075768 has 64 divisors (see below), whose sum is σ = 3644847360. Its totient is φ = 681440256.

The previous prime is 1645075753. The next prime is 1645075777. The reversal of 1645075768 is 8675705461.

It is a happy number.

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, 230055 + ... + 237097.

It is an arithmetic number, because the mean of its divisors is an integer number (56950740).

Almost surely, 2^1645075768 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 1645075768, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1822423680).

1645075768 is an abundant number, since it is smaller than the sum of its proper divisors (1999771592).

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

1645075768 is a wasteful number, since it uses less digits than its factorization.

1645075768 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7196 (or 7192 counting only the distinct ones).

The product of its (nonzero) digits is 1411200, while the sum is 49.

The square root of 1645075768 is about 40559.5336265101. The cubic root of 1645075768 is about 1180.4890647253.

The spelling of 1645075768 in words is "one billion, six hundred forty-five million, seventy-five thousand, seven hundred sixty-eight".