1645303680 has 96 divisors (see below), whose sum is σ = 5681459160. Its totient is φ = 438746112.

The previous prime is 1645303633. The next prime is 1645303697. The reversal of 1645303680 is 863035461.

1645303680 is a `hidden beast` number, since 1 + 64 + 530 + 3 + 68 + 0 = 666.

It is a tau number, because it is divible by the number of its divisors (96).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 137062 + ... + 148581.

Almost surely, 2^1645303680 is an apocalyptic number.

1645303680 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1645303680 is an abundant number, since it is smaller than the sum of its proper divisors (4036155480).

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

1645303680 is a wasteful number, since it uses less digits than its factorization.

1645303680 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 285668 (or 285653 counting only the distinct ones).

The product of its (nonzero) digits is 51840, while the sum is 36.

The square root of 1645303680 is about 40562.3431275857. The cubic root of 1645303680 is about 1180.5435779591.

The spelling of 1645303680 in words is "one billion, six hundred forty-five million, three hundred three thousand, six hundred eighty".