3640657065 has 16 divisors (see below), whose sum is σ = 5828500800. Its totient is φ = 1940533952.

The previous prime is 3640657037. The next prime is 3640657073. The reversal of 3640657065 is 5607560463.

It is a cyclic number.

It is not a de Polignac number, because 3640657065 - 2⁶ = 3640657001 is a prime.

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 45375 + ... + 96644.

It is an arithmetic number, because the mean of its divisors is an integer number (364281300).

Almost surely, 2^3640657065 is an apocalyptic number.

It is an amenable number.

3640657065 is a deficient number, since it is larger than the sum of its proper divisors (2187843735).

3640657065 is a wasteful number, since it uses less digits than its factorization.

3640657065 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 143736.

The product of its (nonzero) digits is 453600, while the sum is 42.

The square root of 3640657065 is about 60337.8576434397. The cubic root of 3640657065 is about 1538.3668898057.

The spelling of 3640657065 in words is "three billion, six hundred forty million, six hundred fifty-seven thousand, sixty-five".