9977997800 has 96 divisors (see below), whose sum is σ = 23851520280. Its totient is φ = 3879628800.

The previous prime is 9977997791. The next prime is 9977997853. The reversal of 9977997800 is 87997799.

It can be written as a sum of positive squares in 12 ways, for example, as 86899684 + 9891098116 = 9322^2 + 99454^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2400524 + ... + 2404676.

Almost surely, 2^9977997800 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 9977997800, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (11925760140).

9977997800 is an abundant number, since it is smaller than the sum of its proper divisors (13873522480).

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

9977997800 is a wasteful number, since it uses less digits than its factorization.

9977997800 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4503 (or 4494 counting only the distinct ones).

The product of its (nonzero) digits is 18003384, while the sum is 65.

The square root of 9977997800 is about 99889.9284212377. The cubic root of 9977997800 is about 2152.8534530099.

The spelling of 9977997800 in words is "nine billion, nine hundred seventy-seven million, nine hundred ninety-seven thousand, eight hundred".