9987770 has 16 divisors (see below), whose sum is σ = 19361160. Its totient is φ = 3687744.

The previous prime is 9987737. The next prime is 9987793. The reversal of 9987770 is 777899.

9987770 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 9102289 + 885481 = 3017^2 + 941^2 .

It is a nialpdrome in base 10.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 38285 + ... + 38544.

Almost surely, 2^9987770 is an apocalyptic number.

9987770 is a deficient number, since it is larger than the sum of its proper divisors (9373390).

9987770 is a wasteful number, since it uses less digits than its factorization.

9987770 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 76849.

The product of its (nonzero) digits is 222264, while the sum is 47.

The square root of 9987770 is about 3160.3433357786. The cubic root of 9987770 is about 215.3556040530.

The spelling of 9987770 in words is "nine million, nine hundred eighty-seven thousand, seven hundred seventy".