3878215828 has 18 divisors (see below), whose sum is σ = 6971668746. Its totient is φ = 1886331024.

The previous prime is 3878215823. The next prime is 3878215829. The reversal of 3878215828 is 8285128783.

It can be written as a sum of positive squares in only one way, i.e., 3773399184 + 104816644 = 61428^2 + 10238^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3878215823) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 755053 + ... + 760171.

Almost surely, 2^3878215828 is an apocalyptic number.

It is an amenable number.

3878215828 is a deficient number, since it is larger than the sum of its proper divisors (3093452918).

3878215828 is an frugal number, since it uses more digits than its factorization.

3878215828 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10279 (or 5158 counting only the distinct ones).

The product of its digits is 1720320, while the sum is 52.

The square root of 3878215828 is about 62275.3227851932. The cubic root of 3878215828 is about 1571.1247066942.

The spelling of 3878215828 in words is "three billion, eight hundred seventy-eight million, two hundred fifteen thousand, eight hundred twenty-eight".