1287028 has 6 divisors (see below), whose sum is σ = 2252306. Its totient is φ = 643512.

The previous prime is 1287007. The next prime is 1287047. The reversal of 1287028 is 8207821.

It can be written as a sum of positive squares in only one way, i.e., 1004004 + 283024 = 1002^2 + 532^2 .

It is a junction number, because it is equal to n+sod(n) for n = 1286987 and 1287005.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 160875 + ... + 160882.

2^1287028 is an apocalyptic number.

It is an amenable number.

1287028 is a deficient number, since it is larger than the sum of its proper divisors (965278).

1287028 is a wasteful number, since it uses less digits than its factorization.

1287028 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 321761 (or 321759 counting only the distinct ones).

The product of its (nonzero) digits is 1792, while the sum is 28.

The square root of 1287028 is about 1134.4725646749. The cubic root of 1287028 is about 108.7750600635.

The spelling of 1287028 in words is "one million, two hundred eighty-seven thousand, twenty-eight".