2636721164 has 108 divisors (see below), whose sum is σ = 5984683992. Its totient is φ = 1012556160.

The previous prime is 2636721119. The next prime is 2636721167. The reversal of 2636721164 is 4611276362.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (2636721167) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 1730507 + ... + 1732029.

Almost surely, 2^2636721164 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2636721164, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2992341996).

2636721164 is an abundant number, since it is smaller than the sum of its proper divisors (3347962828).

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

2636721164 is a wasteful number, since it uses less digits than its factorization.

2636721164 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1636 (or 1616 counting only the distinct ones).

The product of its digits is 72576, while the sum is 38.

The square root of 2636721164 is about 51349.0132719218. The cubic root of 2636721164 is about 1381.5122335960.

The spelling of 2636721164 in words is "two billion, six hundred thirty-six million, seven hundred twenty-one thousand, one hundred sixty-four".