9987750 has 96 divisors (see below), whose sum is σ = 28327104. Its totient is φ = 2534400.

The previous prime is 9987737. The next prime is 9987793. The reversal of 9987750 is 577899.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a nialpdrome in base 10.

It is a junction number, because it is equal to n+sod(n) for n = 9987696 and 9987705.

It is a congruent number.

It is an unprimeable number.

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 47 ways as a sum of consecutive naturals, for example, 51654 + ... + 51846.

It is an arithmetic number, because the mean of its divisors is an integer number (295074).

Almost surely, 2^9987750 is an apocalyptic number.

9987750 is a gapful number since it is divisible by the number (90) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 9987750, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (14163552).

9987750 is an abundant number, since it is smaller than the sum of its proper divisors (18339354).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

9987750 is a wasteful number, since it uses less digits than its factorization.

9987750 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 239 (or 226 counting only the distinct ones).

The product of its (nonzero) digits is 158760, while the sum is 45.

The square root of 9987750 is about 3160.3401715638. The cubic root of 9987750 is about 215.3554603067.

The spelling of 9987750 in words is "nine million, nine hundred eighty-seven thousand, seven hundred fifty".