1280628136 has 16 divisors (see below), whose sum is σ = 2434998240. Its totient is φ = 631295280.

The previous prime is 1280628091. The next prime is 1280628161. The reversal of 1280628136 is 6318260821.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 1280628095 and 1280628104.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1126746 + ... + 1127881.

It is an arithmetic number, because the mean of its divisors is an integer number (152187390).

Almost surely, 2^1280628136 is an apocalyptic number.

It is an amenable number.

1280628136 is a deficient number, since it is larger than the sum of its proper divisors (1154370104).

1280628136 is a wasteful number, since it uses less digits than its factorization.

1280628136 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2254704 (or 2254700 counting only the distinct ones).

The product of its (nonzero) digits is 27648, while the sum is 37.

The square root of 1280628136 is about 35785.8650307632. The cubic root of 1280628136 is about 1085.9446242002.

Adding to 1280628136 its reverse (6318260821), we get a palindrome (7598888957).

The spelling of 1280628136 in words is "one billion, two hundred eighty million, six hundred twenty-eight thousand, one hundred thirty-six".