1287957768 has 16 divisors (see below), whose sum is σ = 3219894480. Its totient is φ = 429319248.

The previous prime is 1287957739. The next prime is 1287957793. The reversal of 1287957768 is 8677597821.

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, 26832430 + ... + 26832477.

It is an arithmetic number, because the mean of its divisors is an integer number (201243405).

Almost surely, 2^1287957768 is an apocalyptic number.

It is an amenable number.

1287957768 is an abundant number, since it is smaller than the sum of its proper divisors (1931936712).

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

1287957768 is a wasteful number, since it uses less digits than its factorization.

1287957768 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53664916 (or 53664912 counting only the distinct ones).

The product of its digits is 11854080, while the sum is 60.

The square root of 1287957768 is about 35888.1285106928. The cubic root of 1287957768 is about 1088.0124732747.

The spelling of 1287957768 in words is "one billion, two hundred eighty-seven million, nine hundred fifty-seven thousand, seven hundred sixty-eight".