1280271988 has 12 divisors (see below), whose sum is σ = 2241063972. Its totient is φ = 639968000.

The previous prime is 1280271983. The next prime is 1280272111. The reversal of 1280271988 is 8891720821.

It can be written as a sum of positive squares in 2 ways, for example, as 83942244 + 1196329744 = 9162^2 + 34588^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1280271983) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 23995 + ... + 56002.

It is an arithmetic number, because the mean of its divisors is an integer number (186755331).

Almost surely, 2^1280271988 is an apocalyptic number.

It is an amenable number.

1280271988 is a deficient number, since it is larger than the sum of its proper divisors (960791984).

1280271988 is a wasteful number, since it uses less digits than its factorization.

1280271988 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 84002 (or 84000 counting only the distinct ones).

The product of its (nonzero) digits is 129024, while the sum is 46.

The square root of 1280271988 is about 35780.8885859477. Note that the first 3 decimals coincide. The cubic root of 1280271988 is about 1085.8439462975.

The spelling of 1280271988 in words is "one billion, two hundred eighty million, two hundred seventy-one thousand, nine hundred eighty-eight".