1087775987 has 8 divisors (see below), whose sum is σ = 1117678800.
Its totient is φ = 1057899744.
The previous prime is 1087775977. The next prime is 1087775999. The reversal of 1087775987 is 7895777801.
It is a sphenic number, since it is the product of 3 distinct primes.
It is a cyclic number.
It is not a de Polignac number, because 1087775987 - 224 = 1070998771 is a prime.
It is a Duffinian number.
It is not an unprimeable number, because it can be changed into a prime (1087775917) by changing a digit.
It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 99089 + ... + 109517.
It is an arithmetic number, because the mean of its divisors is an integer number (139709850).
Almost surely, 21087775987 is an apocalyptic number.
1087775987 is a deficient number, since it is larger than the sum of its proper divisors (29902813).
1087775987 is a wasteful number, since it uses less digits than its factorization.
1087775987 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 13285.
The product of its (nonzero) digits is 6914880, while the sum is 59.
The square root of 1087775987 is about 32981.4491343240.
The cubic root of 1087775987 is about 1028.4420431212.
The spelling of 1087775987 in words is "one billion, eighty-seven million, seven hundred seventy-five thousand, nine hundred eighty-seven".