998888888777772 has 24 divisors (see below), whose sum is σ = 2330741267403696. Its totient is φ = 332962887651328.

The previous prime is 998888888777771. The next prime is 998888888777779. The reversal of 998888888777772 is 277777888888899.

It is a super-2 number, since 2×998888888777772² (a number of 31 digits) contains 22 as substring.

It is a nialpdrome in base 10.

It is not an unprimeable number, because it can be changed into a prime (998888888777771) 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, 79444588 + ... + 91154924.

It is an arithmetic number, because the mean of its divisors is an integer number (97114219475154).

Almost surely, 2^{998888888777772} is an apocalyptic number.

It is an amenable number.

998888888777772 is an abundant number, since it is smaller than the sum of its proper divisors (1331852378625924).

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

998888888777772 is a wasteful number, since it uses less digits than its factorization.

998888888777772 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18818657 (or 18818655 counting only the distinct ones).

The product of its digits is 5709987053568, while the sum is 111.

The spelling of 998888888777772 in words is "nine hundred ninety-eight trillion, eight hundred eighty-eight billion, eight hundred eighty-eight million, seven hundred seventy-seven thousand, seven hundred seventy-two".