9998777442 has 64 divisors (see below), whose sum is σ = 21208594176. Its totient is φ = 3136066560.

The previous prime is 9998777429. The next prime is 9998777513. The reversal of 9998777442 is 2447778999.

It is a happy number.

It is a nialpdrome in base 10.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 4643038 + ... + 4645190.

It is an arithmetic number, because the mean of its divisors is an integer number (331384284).

Almost surely, 2^9998777442 is an apocalyptic number.

9998777442 is an abundant number, since it is smaller than the sum of its proper divisors (11209816734).

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

9998777442 is a wasteful number, since it uses less digits than its factorization.

9998777442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2715.

The product of its digits is 64012032, while the sum is 66.

The square root of 9998777442 is about 99993.8870231576. The cubic root of 9998777442 is about 2154.3468890749.

The spelling of 9998777442 in words is "nine billion, nine hundred ninety-eight million, seven hundred seventy-seven thousand, four hundred forty-two".