1272319828 has 24 divisors (see below), whose sum is σ = 2411246880. Its totient is φ = 583939680.

The previous prime is 1272319817. The next prime is 1272319859. The reversal of 1272319828 is 8289132721.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 59038 + ... + 77653.

It is an arithmetic number, because the mean of its divisors is an integer number (100468620).

Almost surely, 2^1272319828 is an apocalyptic number.

It is an amenable number.

1272319828 is a deficient number, since it is larger than the sum of its proper divisors (1138927052).

1272319828 is a wasteful number, since it uses less digits than its factorization.

1272319828 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 136887 (or 136885 counting only the distinct ones).

The product of its digits is 96768, while the sum is 43.

The square root of 1272319828 is about 35669.5924843556. The cubic root of 1272319828 is about 1083.5911061126.

The spelling of 1272319828 in words is "one billion, two hundred seventy-two million, three hundred nineteen thousand, eight hundred twenty-eight".