3688828421 has 4 divisors (see below), whose sum is σ = 3689912652. Its totient is φ = 3687744192.

The previous prime is 3688828399. The next prime is 3688828457. The reversal of 3688828421 is 1248288863.

It is a happy number.

3688828421 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 3601200100 + 87628321 = 60010^2 + 9361^2 .

It is a cyclic number.

It is not a de Polignac number, because 3688828421 - 2³⁰ = 2615086597 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 3688828421.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3688828921) 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, 536996 + ... + 543821.

It is an arithmetic number, because the mean of its divisors is an integer number (922478163).

Almost surely, 2^3688828421 is an apocalyptic number.

It is an amenable number.

3688828421 is a deficient number, since it is larger than the sum of its proper divisors (1084231).

3688828421 is a wasteful number, since it uses less digits than its factorization.

3688828421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1084230.

The product of its digits is 1179648, while the sum is 50.

The square root of 3688828421 is about 60735.7260679413. The cubic root of 3688828421 is about 1545.1221502136.

The spelling of 3688828421 in words is "three billion, six hundred eighty-eight million, eight hundred twenty-eight thousand, four hundred twenty-one".