1272828216 has 64 divisors (see below), whose sum is σ = 3675559680. Its totient is φ = 363015680.

The previous prime is 1272828209. The next prime is 1272828217. The reversal of 1272828216 is 6128282721.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1272828217) by changing a digit.

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, 137316 + ... + 146291.

It is an arithmetic number, because the mean of its divisors is an integer number (57430620).

Almost surely, 2^1272828216 is an apocalyptic number.

It is an amenable number.

1272828216 is an abundant number, since it is smaller than the sum of its proper divisors (2402731464).

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

1272828216 is a wasteful number, since it uses less digits than its factorization.

1272828216 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 283644 (or 283640 counting only the distinct ones).

The product of its digits is 43008, while the sum is 39.

The square root of 1272828216 is about 35676.7181226076. The cubic root of 1272828216 is about 1083.7354124278.

The spelling of 1272828216 in words is "one billion, two hundred seventy-two million, eight hundred twenty-eight thousand, two hundred sixteen".