3645868905 has 24 divisors (see below), whose sum is σ = 7222293312. Its totient is φ = 1666682784.

The previous prime is 3645868901. The next prime is 3645868921. The reversal of 3645868905 is 5098685463.

It is a happy number.

It is not a de Polignac number, because 3645868905 - 2² = 3645868901 is a prime.

It is not an unprimeable number, because it can be changed into a prime (3645868901) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 5786779 + ... + 5787408.

It is an arithmetic number, because the mean of its divisors is an integer number (300928888).

Almost surely, 2^3645868905 is an apocalyptic number.

3645868905 is a gapful number since it is divisible by the number (35) formed by its first and last digit.

It is an amenable number.

3645868905 is a deficient number, since it is larger than the sum of its proper divisors (3576424407).

3645868905 is a wasteful number, since it uses less digits than its factorization.

3645868905 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11574205 (or 11574202 counting only the distinct ones).

The product of its (nonzero) digits is 6220800, while the sum is 54.

The square root of 3645868905 is about 60381.0310031222. The cubic root of 3645868905 is about 1539.1006309063.

The spelling of 3645868905 in words is "three billion, six hundred forty-five million, eight hundred sixty-eight thousand, nine hundred five".