1287253688 has 16 divisors (see below), whose sum is σ = 2758400880. Its totient is φ = 551680128.

The previous prime is 1287253679. The next prime is 1287253697. The reversal of 1287253688 is 8863527821.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (1287253679) and next prime (1287253697).

It is a congruent number.

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, 11493281 + ... + 11493392.

It is an arithmetic number, because the mean of its divisors is an integer number (172400055).

Almost surely, 2^1287253688 is an apocalyptic number.

It is an amenable number.

1287253688 is an abundant number, since it is smaller than the sum of its proper divisors (1471147192).

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

1287253688 is a wasteful number, since it uses less digits than its factorization.

1287253688 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22986686 (or 22986682 counting only the distinct ones).

The product of its digits is 1290240, while the sum is 50.

The square root of 1287253688 is about 35878.3177978009. The cubic root of 1287253688 is about 1087.8141780940.

The spelling of 1287253688 in words is "one billion, two hundred eighty-seven million, two hundred fifty-three thousand, six hundred eighty-eight".