1287716512 has 24 divisors (see below), whose sum is σ = 2551349556. Its totient is φ = 639754752.

The previous prime is 1287716447. The next prime is 1287716537. The reversal of 1287716512 is 2156177821.

It can be written as a sum of positive squares in 2 ways, for example, as 1188594576 + 99121936 = 34476^2 + 9956^2 .

It is a super-2 number, since 2×1287716512² = 3316427630554892288, which contains 22 as substring.

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, 123133 + ... + 133180.

Almost surely, 2^1287716512 is an apocalyptic number.

It is an amenable number.

1287716512 is a deficient number, since it is larger than the sum of its proper divisors (1263633044).

1287716512 is a wasteful number, since it uses less digits than its factorization.

1287716512 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 256480 (or 256472 counting only the distinct ones).

The product of its digits is 47040, while the sum is 40.

The square root of 1287716512 is about 35884.7671303577. The cubic root of 1287716512 is about 1087.9445347301.

The spelling of 1287716512 in words is "one billion, two hundred eighty-seven million, seven hundred sixteen thousand, five hundred twelve".