9978492520 has 32 divisors (see below), whose sum is σ = 22500351720. Its totient is φ = 3982731520.

The previous prime is 9978492509. The next prime is 9978492539. The reversal of 9978492520 is 252948799.

It can be written as a sum of positive squares in 4 ways, for example, as 9381472164 + 597020356 = 96858^2 + 24434^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 252127 + ... + 289006.

Almost surely, 2^9978492520 is an apocalyptic number.

It is an amenable number.

9978492520 is an abundant number, since it is smaller than the sum of its proper divisors (12521859200).

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

9978492520 is a wasteful number, since it uses less digits than its factorization.

9978492520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 541605 (or 541601 counting only the distinct ones).

The product of its (nonzero) digits is 3265920, while the sum is 55.

The square root of 9978492520 is about 99892.4047162746. The cubic root of 9978492520 is about 2152.8890326950.

The spelling of 9978492520 in words is "nine billion, nine hundred seventy-eight million, four hundred ninety-two thousand, five hundred twenty".