3213731828 has 12 divisors (see below), whose sum is σ = 5627040132. Its totient is φ = 1606006080.

The previous prime is 3213731783. The next prime is 3213731837. The reversal of 3213731828 is 8281373123.

It can be written as a sum of positive squares in 2 ways, for example, as 2165785444 + 1047946384 = 46538^2 + 32372^2 .

It is a junction number, because it is equal to n+sod(n) for n = 3213731791 and 3213731800.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 206513 + ... + 221528.

It is an arithmetic number, because the mean of its divisors is an integer number (468920011).

Almost surely, 2^3213731828 is an apocalyptic number.

It is an amenable number.

3213731828 is a deficient number, since it is larger than the sum of its proper divisors (2413308304).

3213731828 is a wasteful number, since it uses less digits than its factorization.

3213731828 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 429922 (or 429920 counting only the distinct ones).

The product of its digits is 48384, while the sum is 38.

The square root of 3213731828 is about 56689.7859230391. The cubic root of 3213731828 is about 1475.7174451726.

The spelling of 3213731828 in words is "three billion, two hundred thirteen million, seven hundred thirty-one thousand, eight hundred twenty-eight".