9990478420000 has 120 divisors (see below), whose sum is σ = 26468697364956. Its totient is φ = 3688791936000.

The previous prime is 9990478419997. The next prime is 9990478420007. The reversal of 9990478420000 is 248740999.

It is a happy number.

It can be written as a sum of positive squares in 10 ways, for example, as 5348470280976 + 4642008139024 = 2312676^2 + 2154532^2 .

It is a Harshad number since it is a multiple of its sum of digits (52).

It is a self number, because there is not a number n which added to its sum of digits gives 9990478420000.

It is not an unprimeable number, because it can be changed into a prime (9990478420007) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 18952459 + ... + 19472458.

Almost surely, 2^{9990478420000} is an apocalyptic number.

It is an amenable number.

9990478420000 is an abundant number, since it is smaller than the sum of its proper divisors (16478218944956).

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

9990478420000 is a wasteful number, since it uses less digits than its factorization.

9990478420000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38424960 (or 38424937 counting only the distinct ones).

The product of its (nonzero) digits is 1306368, while the sum is 52.

The spelling of 9990478420000 in words is "nine trillion, nine hundred ninety billion, four hundred seventy-eight million, four hundred twenty thousand".