1287666530 has 32 divisors (see below), whose sum is σ = 2533317120. Its totient is φ = 469128960.

The previous prime is 1287666521. The next prime is 1287666533. The reversal of 1287666530 is 356667821.

It is a Smith number, since the sum of its digits (44) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (1287666533) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 116900 + ... + 127439.

It is an arithmetic number, because the mean of its divisors is an integer number (79166160).

Almost surely, 2^1287666530 is an apocalyptic number.

1287666530 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1287666530 is a deficient number, since it is larger than the sum of its proper divisors (1245650590).

1287666530 is a wasteful number, since it uses less digits than its factorization.

1287666530 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 244394.

The product of its (nonzero) digits is 362880, while the sum is 44.

The square root of 1287666530 is about 35884.0706999638. The cubic root of 1287666530 is about 1087.9304585607.

The spelling of 1287666530 in words is "one billion, two hundred eighty-seven million, six hundred sixty-six thousand, five hundred thirty".