1280628132 has 72 divisors (see below), whose sum is σ = 3627158976. Its totient is φ = 349981632.

The previous prime is 1280628091. The next prime is 1280628161. The reversal of 1280628132 is 2318260821.

It is a junction number, because it is equal to n+sod(n) for n = 1280628093 and 1280628102.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 33823 + ... + 60870.

It is an arithmetic number, because the mean of its divisors is an integer number (50377208).

Almost surely, 2^1280628132 is an apocalyptic number.

1280628132 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1280628132 is an abundant number, since it is smaller than the sum of its proper divisors (2346530844).

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

1280628132 is a wasteful number, since it uses less digits than its factorization.

1280628132 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 94737 (or 94728 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 33.

The square root of 1280628132 is about 35785.8649748752. The cubic root of 1280628132 is about 1085.9446230695.

Adding to 1280628132 its reverse (2318260821), we get a palindrome (3598888953).

The spelling of 1280628132 in words is "one billion, two hundred eighty million, six hundred twenty-eight thousand, one hundred thirty-two".