1636044436 has 48 divisors (see below), whose sum is σ = 3286861200. Its totient is φ = 705853440.

The previous prime is 1636044373. The next prime is 1636044463. The reversal of 1636044436 is 6344406361.

It can be written as a sum of positive squares in 8 ways, for example, as 2268036 + 1633776400 = 1506^2 + 40420^2 .

It is a junction number, because it is equal to n+sod(n) for n = 1636044395 and 1636044404.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 125506 + ... + 137926.

It is an arithmetic number, because the mean of its divisors is an integer number (68476275).

Almost surely, 2^1636044436 is an apocalyptic number.

It is an amenable number.

1636044436 is an abundant number, since it is smaller than the sum of its proper divisors (1650816764).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1636044436 is a wasteful number, since it uses less digits than its factorization.

1636044436 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12604 (or 12602 counting only the distinct ones).

The product of its (nonzero) digits is 124416, while the sum is 37.

The square root of 1636044436 is about 40448.0461332807. The cubic root of 1636044436 is about 1178.3248364571.

The spelling of 1636044436 in words is "one billion, six hundred thirty-six million, forty-four thousand, four hundred thirty-six".