1645395604 has 12 divisors (see below), whose sum is σ = 2882275200. Its totient is φ = 821888408.

The previous prime is 1645395593. The next prime is 1645395607. The reversal of 1645395604 is 4065935461.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1645395607) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 197764 + ... + 205915.

It is an arithmetic number, because the mean of its divisors is an integer number (240189600).

Almost surely, 2^1645395604 is an apocalyptic number.

It is an amenable number.

1645395604 is a deficient number, since it is larger than the sum of its proper divisors (1236879596).

1645395604 is a wasteful number, since it uses less digits than its factorization.

1645395604 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 404702 (or 404700 counting only the distinct ones).

The product of its (nonzero) digits is 388800, while the sum is 43.

The square root of 1645395604 is about 40563.4762317038. The cubic root of 1645395604 is about 1180.5655634175.

The spelling of 1645395604 in words is "one billion, six hundred forty-five million, three hundred ninety-five thousand, six hundred four".