1087775988 has 96 divisors (see below), whose sum is σ = 2887729152.
Its totient is φ = 316310400.
The previous prime is 1087775977. The next prime is 1087775999. The reversal of 1087775988 is 8895777801.
It is a happy number.
It is an interprime number because it is at equal distance from previous prime (1087775977) and next prime (1087775999).
It is a super-2 number, since 2×10877759882 = 2366513200138752288, which contains 22 as substring.
It is a congruent number.
It is an unprimeable number.
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 31 ways as a sum of consecutive naturals, for example, 205333 + ... + 210563.
It is an arithmetic number, because the mean of its divisors is an integer number (30080512).
Almost surely, 21087775988 is an apocalyptic number.
It is an amenable number.
It is a practical number, because each smaller number is the sum of distinct divisors of 1087775988, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1443864576).
1087775988 is an abundant number, since it is smaller than the sum of its proper divisors (1799953164).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
1087775988 is a wasteful number, since it uses less digits than its factorization.
1087775988 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 5325 (or 5323 counting only the distinct ones).
The product of its (nonzero) digits is 7902720, while the sum is 60.
The square root of 1087775988 is about 32981.4491494840.
The cubic root of 1087775988 is about 1028.4420434364.
The spelling of 1087775988 in words is "one billion, eighty-seven million, seven hundred seventy-five thousand, nine hundred eighty-eight".