1645488804 has 24 divisors (see below), whose sum is σ = 3963328768. Its totient is φ = 530802720.

The previous prime is 1645488751. The next prime is 1645488809. The reversal of 1645488804 is 4088845461.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (1645488809) 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 7 ways as a sum of consecutive naturals, for example, 2211307 + ... + 2212050.

Almost surely, 2^1645488804 is an apocalyptic number.

It is an amenable number.

1645488804 is an abundant number, since it is smaller than the sum of its proper divisors (2317839964).

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

1645488804 is a wasteful number, since it uses less digits than its factorization.

1645488804 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4423395 (or 4423393 counting only the distinct ones).

The product of its (nonzero) digits is 983040, while the sum is 48.

The square root of 1645488804 is about 40564.6250321632. The cubic root of 1645488804 is about 1180.5878532208.

The spelling of 1645488804 in words is "one billion, six hundred forty-five million, four hundred eighty-eight thousand, eight hundred four".