9988779 has 8 divisors (see below), whose sum is σ = 13678480. Its totient is φ = 6479136.

The previous prime is 9988757. The next prime is 9988793. The reversal of 9988779 is 9778899.

It is a happy number.

9988779 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 9988779 - 2⁵ = 9988747 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (9988579) 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, 44884 + ... + 45105.

It is an arithmetic number, because the mean of its divisors is an integer number (1709810).

Almost surely, 2^9988779 is an apocalyptic number.

9988779 is a deficient number, since it is larger than the sum of its proper divisors (3689701).

9988779 is a wasteful number, since it uses less digits than its factorization.

9988779 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 90029.

The product of its digits is 2286144, while the sum is 57.

The square root of 9988779 is about 3160.5029663014. The cubic root of 9988779 is about 215.3628558048.

The spelling of 9988779 in words is "nine million, nine hundred eighty-eight thousand, seven hundred seventy-nine".