1645488876 has 12 divisors (see below), whose sum is σ = 3839474072. Its totient is φ = 548496288.

The previous prime is 1645488853. The next prime is 1645488881. The reversal of 1645488876 is 6788845461.

It is a tau number, because it is divible by the number of its divisors (12).

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 68562025 + ... + 68562048.

Almost surely, 2^1645488876 is an apocalyptic number.

It is an amenable number.

1645488876 is an abundant number, since it is smaller than the sum of its proper divisors (2193985196).

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

1645488876 is a wasteful number, since it uses less digits than its factorization.

1645488876 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 137124080 (or 137124078 counting only the distinct ones).

The product of its digits is 10321920, while the sum is 57.

The square root of 1645488876 is about 40564.6259196359. The cubic root of 1645488876 is about 1180.5878704401.

The spelling of 1645488876 in words is "one billion, six hundred forty-five million, four hundred eighty-eight thousand, eight hundred seventy-six".