1287198568 has 8 divisors (see below), whose sum is σ = 2413497330. Its totient is φ = 643599280.

The previous prime is 1287198559. The next prime is 1287198581. The reversal of 1287198568 is 8658917821.

It can be written as a sum of positive squares in only one way, i.e., 953697924 + 333500644 = 30882^2 + 18262^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a super-2 number, since 2×1287198568² = 3313760306922501248, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80449903 + ... + 80449918.

Almost surely, 2^1287198568 is an apocalyptic number.

It is an amenable number.

1287198568 is a deficient number, since it is larger than the sum of its proper divisors (1126298762).

1287198568 is a wasteful number, since it uses less digits than its factorization.

1287198568 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 160899827 (or 160899823 counting only the distinct ones).

The product of its digits is 1935360, while the sum is 55.

The square root of 1287198568 is about 35877.5496376216. The cubic root of 1287198568 is about 1087.7986511952.

The spelling of 1287198568 in words is "one billion, two hundred eighty-seven million, one hundred ninety-eight thousand, five hundred sixty-eight".