1645433004 has 24 divisors (see below), whose sum is σ = 3963194368. Its totient is φ = 530784720.

The previous prime is 1645432993. The next prime is 1645433017. The reversal of 1645433004 is 4003345461.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2211232 + ... + 2211975.

Almost surely, 2^1645433004 is an apocalyptic number.

It is an amenable number.

1645433004 is an abundant number, since it is smaller than the sum of its proper divisors (2317761364).

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

1645433004 is a wasteful number, since it uses less digits than its factorization.

1645433004 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4423245 (or 4423243 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 30.

The square root of 1645433004 is about 40563.9372349381. The cubic root of 1645433004 is about 1180.5745081393.

Adding to 1645433004 its reverse (4003345461), we get a palindrome (5648778465).

The spelling of 1645433004 in words is "one billion, six hundred forty-five million, four hundred thirty-three thousand, four".