1287023428 has 12 divisors (see below), whose sum is σ = 2252735212. Its totient is φ = 643384800.

The previous prime is 1287023389. The next prime is 1287023431. The reversal of 1287023428 is 8243207821.

It can be written as a sum of positive squares in 2 ways, for example, as 788037184 + 498986244 = 28072^2 + 22338^2 .

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, 6723 + ... + 51178.

Almost surely, 2^1287023428 is an apocalyptic number.

It is an amenable number.

1287023428 is a deficient number, since it is larger than the sum of its proper divisors (965711784).

1287023428 is a wasteful number, since it uses less digits than its factorization.

1287023428 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 63462 (or 63460 counting only the distinct ones).

The product of its (nonzero) digits is 43008, while the sum is 37.

The square root of 1287023428 is about 35875.1087524484. The cubic root of 1287023428 is about 1087.7493126026.

The spelling of 1287023428 in words is "one billion, two hundred eighty-seven million, twenty-three thousand, four hundred twenty-eight".