3645638835 has 16 divisors (see below), whose sum is σ = 5833788576. Its totient is φ = 1944085248.

The previous prime is 3645638809. The next prime is 3645638849. The reversal of 3645638835 is 5388365463.

It is a happy number.

It is not a de Polignac number, because 3645638835 - 2¹⁵ = 3645606067 is a prime.

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, 178047 + ... + 197463.

It is an arithmetic number, because the mean of its divisors is an integer number (364611786).

Almost surely, 2^3645638835 is an apocalyptic number.

3645638835 is a deficient number, since it is larger than the sum of its proper divisors (2188149741).

3645638835 is a wasteful number, since it uses less digits than its factorization.

3645638835 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31942.

The product of its digits is 6220800, while the sum is 51.

The square root of 3645638835 is about 60379.1258217606. The cubic root of 3645638835 is about 1539.0682556034.

The spelling of 3645638835 in words is "three billion, six hundred forty-five million, six hundred thirty-eight thousand, eight hundred thirty-five".