1287516478 has 8 divisors (see below), whose sum is σ = 1931464080. Its totient is φ = 643695120.

The previous prime is 1287516473. The next prime is 1287516487. The reversal of 1287516478 is 8746157821.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×1287516478² = 3315397362243048968, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1287516473) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 418 + ... + 50746.

It is an arithmetic number, because the mean of its divisors is an integer number (241433010).

Almost surely, 2^1287516478 is an apocalyptic number.

1287516478 is a deficient number, since it is larger than the sum of its proper divisors (643947602).

1287516478 is a wasteful number, since it uses less digits than its factorization.

1287516478 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 63122.

The product of its digits is 752640, while the sum is 49.

The square root of 1287516478 is about 35881.9798506158. The cubic root of 1287516478 is about 1087.8881980120. Note that the first 3 decimals are identical.

The spelling of 1287516478 in words is "one billion, two hundred eighty-seven million, five hundred sixteen thousand, four hundred seventy-eight".