1287876628 has 12 divisors (see below), whose sum is σ = 2351774880. Its totient is φ = 615940952.

The previous prime is 1287876619. The next prime is 1287876641. The reversal of 1287876628 is 8266787821.

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, 6999238 + ... + 6999421.

It is an arithmetic number, because the mean of its divisors is an integer number (195981240).

Almost surely, 2^1287876628 is an apocalyptic number.

It is an amenable number.

1287876628 is a deficient number, since it is larger than the sum of its proper divisors (1063898252).

1287876628 is a wasteful number, since it uses less digits than its factorization.

1287876628 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13998686 (or 13998684 counting only the distinct ones).

The product of its digits is 3612672, while the sum is 55.

The square root of 1287876628 is about 35886.9980355003. The cubic root of 1287876628 is about 1087.9896249101.

The spelling of 1287876628 in words is "one billion, two hundred eighty-seven million, eight hundred seventy-six thousand, six hundred twenty-eight".