1287995528 has 16 divisors (see below), whose sum is σ = 2415983760. Its totient is φ = 643733200.

The previous prime is 1287995507. The next prime is 1287995549. The reversal of 1287995528 is 8255997821.

It is an interprime number because it is at equal distance from previous prime (1287995507) and next prime (1287995549).

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, 11558 + ... + 52053.

It is an arithmetic number, because the mean of its divisors is an integer number (150998985).

Almost surely, 2^1287995528 is an apocalyptic number.

It is an amenable number.

1287995528 is a deficient number, since it is larger than the sum of its proper divisors (1127988232).

1287995528 is a wasteful number, since it uses less digits than its factorization.

1287995528 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 66148 (or 66144 counting only the distinct ones).

The product of its digits is 3628800, while the sum is 56.

The square root of 1287995528 is about 35888.6545860945. The cubic root of 1287995528 is about 1088.0231058566.

The spelling of 1287995528 in words is "one billion, two hundred eighty-seven million, nine hundred ninety-five thousand, five hundred twenty-eight".