1287724087 has 12 divisors (see below), whose sum is σ = 1392635496. Its totient is φ = 1183669200.

The previous prime is 1287724051. The next prime is 1287724111. The reversal of 1287724087 is 7804277821.

It is not a de Polignac number, because 1287724087 - 2¹¹ = 1287722039 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1287724037) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1224712 + ... + 1225762.

It is an arithmetic number, because the mean of its divisors is an integer number (116052958).

Almost surely, 2^1287724087 is an apocalyptic number.

1287724087 is a deficient number, since it is larger than the sum of its proper divisors (104911409).

1287724087 is an equidigital number, since it uses as much as digits as its factorization.

1287724087 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1678 (or 1371 counting only the distinct ones).

The product of its (nonzero) digits is 351232, while the sum is 46.

The square root of 1287724087 is about 35884.8726763799. The cubic root of 1287724087 is about 1087.9466680060.

The spelling of 1287724087 in words is "one billion, two hundred eighty-seven million, seven hundred twenty-four thousand, eighty-seven".