9987625 has 8 divisors (see below), whose sum is σ = 12464712. Its totient is φ = 7990000.

The previous prime is 9987617. The next prime is 9987643. The reversal of 9987625 is 5267899.

It can be written as a sum of positive squares in 4 ways, for example, as 861184 + 9126441 = 928^2 + 3021^2 .

It is not a de Polignac number, because 9987625 - 2³ = 9987617 is a prime.

It is a Duffinian number.

9987625 is a lucky number.

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, 39826 + ... + 40075.

It is an arithmetic number, because the mean of its divisors is an integer number (1558089).

Almost surely, 2^9987625 is an apocalyptic number.

It is an amenable number.

9987625 is a deficient number, since it is larger than the sum of its proper divisors (2477087).

9987625 is an equidigital number, since it uses as much as digits as its factorization.

9987625 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 79916 (or 79906 counting only the distinct ones).

The product of its digits is 272160, while the sum is 46.

The square root of 9987625 is about 3160.3203951498. The cubic root of 9987625 is about 215.3545618879.

The spelling of 9987625 in words is "nine million, nine hundred eighty-seven thousand, six hundred twenty-five".