1636844164 has 12 divisors (see below), whose sum is σ = 2865464784. Its totient is φ = 818139944.

The previous prime is 1636844161. The next prime is 1636844177. The reversal of 1636844164 is 4614486361.

It is a self number, because there is not a number n which added to its sum of digits gives 1636844164.

It is not an unprimeable number, because it can be changed into a prime (1636844161) 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, 57202 + ... + 80905.

It is an arithmetic number, because the mean of its divisors is an integer number (238788732).

Almost surely, 2^1636844164 is an apocalyptic number.

It is an amenable number.

1636844164 is a deficient number, since it is larger than the sum of its proper divisors (1228620620).

1636844164 is a wasteful number, since it uses less digits than its factorization.

1636844164 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 141074 (or 141072 counting only the distinct ones).

The product of its digits is 331776, while the sum is 43.

The square root of 1636844164 is about 40457.9307923675. The cubic root of 1636844164 is about 1178.5168006527.

The spelling of 1636844164 in words is "one billion, six hundred thirty-six million, eight hundred forty-four thousand, one hundred sixty-four".