3172320828 has 48 divisors (see below), whose sum is σ = 8283744000. Its totient is φ = 1049827824.

The previous prime is 3172320787. The next prime is 3172320841. The reversal of 3172320828 is 8280232713.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 3172320792 and 3172320801.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 90648 + ... + 120671.

It is an arithmetic number, because the mean of its divisors is an integer number (172578000).

Almost surely, 2^3172320828 is an apocalyptic number.

It is an amenable number.

3172320828 is an abundant number, since it is smaller than the sum of its proper divisors (5111423172).

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

3172320828 is a wasteful number, since it uses less digits than its factorization.

3172320828 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 211471 (or 211463 counting only the distinct ones).

The product of its (nonzero) digits is 32256, while the sum is 36.

The square root of 3172320828 is about 56323.3595233807. The cubic root of 3172320828 is about 1469.3515007082.

The spelling of 3172320828 in words is "three billion, one hundred seventy-two million, three hundred twenty thousand, eight hundred twenty-eight".