1645286188 has 48 divisors (see below), whose sum is σ = 3658031104. Its totient is φ = 629881920.

The previous prime is 1645286147. The next prime is 1645286189. The reversal of 1645286188 is 8816825461.

It is not an unprimeable number, because it can be changed into a prime (1645286189) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 61620 + ... + 84187.

Almost surely, 2^1645286188 is an apocalyptic number.

It is an amenable number.

1645286188 is an abundant number, since it is smaller than the sum of its proper divisors (2012744916).

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

1645286188 is a wasteful number, since it uses less digits than its factorization.

1645286188 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 145862 (or 145860 counting only the distinct ones).

The product of its digits is 737280, while the sum is 49.

The square root of 1645286188 is about 40562.1275083051. The cubic root of 1645286188 is about 1180.5393943056.

The spelling of 1645286188 in words is "one billion, six hundred forty-five million, two hundred eighty-six thousand, one hundred eighty-eight".