1287915670 has 16 divisors (see below), whose sum is σ = 2347594560. Its totient is φ = 508644864.

The previous prime is 1287915637. The next prime is 1287915679. The reversal of 1287915670 is 765197821.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 1287915670.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1287915679) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 814347 + ... + 815926.

It is an arithmetic number, because the mean of its divisors is an integer number (146724660).

Almost surely, 2^1287915670 is an apocalyptic number.

1287915670 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1287915670 is a deficient number, since it is larger than the sum of its proper divisors (1059678890).

1287915670 is a wasteful number, since it uses less digits than its factorization.

1287915670 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1630359.

The product of its (nonzero) digits is 211680, while the sum is 46.

The square root of 1287915670 is about 35887.5419888295. The cubic root of 1287915670 is about 1088.0006189398. Note that the first 3 decimals are identical.

The spelling of 1287915670 in words is "one billion, two hundred eighty-seven million, nine hundred fifteen thousand, six hundred seventy".