1287663900 has 36 divisors (see below), whose sum is σ = 3725641752. Its totient is φ = 343376960.

The previous prime is 1287663893. The next prime is 1287663911. The reversal of 1287663900 is 93667821.

It is a happy number.

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 in 11 ways as a sum of consecutive naturals, for example, 2145807 + ... + 2146406.

Almost surely, 2^1287663900 is an apocalyptic number.

1287663900 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1287663900 is an abundant number, since it is smaller than the sum of its proper divisors (2437977852).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1287663900 is a wasteful number, since it uses less digits than its factorization.

1287663900 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4292230 (or 4292223 counting only the distinct ones).

The product of its (nonzero) digits is 108864, while the sum is 42.

The square root of 1287663900 is about 35884.0340541584. The cubic root of 1287663900 is about 1087.9297178775.

The spelling of 1287663900 in words is "one billion, two hundred eighty-seven million, six hundred sixty-three thousand, nine hundred".