1280136136 has 32 divisors (see below), whose sum is σ = 2452239360. Its totient is φ = 626272192.

The previous prime is 1280136131. The next prime is 1280136149. The reversal of 1280136136 is 6316310821.

It is a junction number, because it is equal to n+sod(n) for n = 1280136098 and 1280136107.

It is not an unprimeable number, because it can be changed into a prime (1280136131) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 158451 + ... + 166333.

It is an arithmetic number, because the mean of its divisors is an integer number (76632480).

Almost surely, 2^1280136136 is an apocalyptic number.

It is an amenable number.

1280136136 is a deficient number, since it is larger than the sum of its proper divisors (1172103224).

1280136136 is a wasteful number, since it uses less digits than its factorization.

1280136136 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8325 (or 8321 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 31.

The square root of 1280136136 is about 35778.9901478507. The cubic root of 1280136136 is about 1085.8055379772.

Adding to 1280136136 its reverse (6316310821), we get a palindrome (7596446957).

The spelling of 1280136136 in words is "one billion, two hundred eighty million, one hundred thirty-six thousand, one hundred thirty-six".