1287606436 has 12 divisors (see below), whose sum is σ = 2255315020. Its totient is φ = 643230720.

The previous prime is 1287606431. The next prime is 1287606443. The reversal of 1287606436 is 6346067821.

It can be written as a sum of positive squares in 2 ways, for example, as 80460900 + 1207145536 = 8970^2 + 34744^2 .

It is a junction number, because it is equal to n+sod(n) for n = 1287606392 and 1287606401.

It is not an unprimeable number, because it can be changed into a prime (1287606431) 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, 138045 + ... + 147076.

Almost surely, 2^1287606436 is an apocalyptic number.

It is an amenable number.

1287606436 is a deficient number, since it is larger than the sum of its proper divisors (967708584).

1287606436 is a wasteful number, since it uses less digits than its factorization.

1287606436 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 286254 (or 286252 counting only the distinct ones).

The product of its (nonzero) digits is 290304, while the sum is 43.

The square root of 1287606436 is about 35883.2333548692. The cubic root of 1287606436 is about 1087.9135341194.

It can be divided in two parts, 128 and 7606436, that added together give a square (7606564 = 2758²).

The spelling of 1287606436 in words is "one billion, two hundred eighty-seven million, six hundred six thousand, four hundred thirty-six".