3686821623 has 8 divisors (see below), whose sum is σ = 5461958000. Its totient is φ = 2457881064.

The previous prime is 3686821609. The next prime is 3686821627. The reversal of 3686821623 is 3261286863.

It is a happy number.

It is a de Polignac number, because none of the positive numbers 2^k-3686821623 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3686821627) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 68274448 + ... + 68274501.

It is an arithmetic number, because the mean of its divisors is an integer number (682744750).

Almost surely, 2^3686821623 is an apocalyptic number.

3686821623 is a deficient number, since it is larger than the sum of its proper divisors (1775136377).

3686821623 is a wasteful number, since it uses less digits than its factorization.

3686821623 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 136548958 (or 136548952 counting only the distinct ones).

The product of its digits is 497664, while the sum is 45.

The square root of 3686821623 is about 60719.2030827151. The cubic root of 3686821623 is about 1544.8419067192.

The spelling of 3686821623 in words is "three billion, six hundred eighty-six million, eight hundred twenty-one thousand, six hundred twenty-three".