1281275428 has 6 divisors (see below), whose sum is σ = 2242232006. Its totient is φ = 640637712.

The previous prime is 1281275423. The next prime is 1281275449. The reversal of 1281275428 is 8245721821.

It can be written as a sum of positive squares in only one way, i.e., 791184384 + 490091044 = 28128^2 + 22138^2 .

It is not an unprimeable number, because it can be changed into a prime (1281275423) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 160159425 + ... + 160159432.

Almost surely, 2^1281275428 is an apocalyptic number.

It is an amenable number.

1281275428 is a deficient number, since it is larger than the sum of its proper divisors (960956578).

1281275428 is a wasteful number, since it uses less digits than its factorization.

1281275428 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 320318861 (or 320318859 counting only the distinct ones).

The product of its digits is 71680, while the sum is 40.

The square root of 1281275428 is about 35794.9078501398. The cubic root of 1281275428 is about 1086.1275565312.

The spelling of 1281275428 in words is "one billion, two hundred eighty-one million, two hundred seventy-five thousand, four hundred twenty-eight".