9978949620 has 72 divisors (see below), whose sum is σ = 30684171336. Its totient is φ = 2624596992.

The previous prime is 9978949613. The next prime is 9978949621. The reversal of 9978949620 is 269498799.

It can be written as a sum of positive squares in 4 ways, for example, as 3628134756 + 6350814864 = 60234^2 + 79692^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9978949621) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 366577 + ... + 392856.

Almost surely, 2^9978949620 is an apocalyptic number.

9978949620 is a gapful number since it is divisible by the number (90) formed by its first and last digit.

It is an amenable number.

9978949620 is an abundant number, since it is smaller than the sum of its proper divisors (20705221716).

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

9978949620 is a wasteful number, since it uses less digits than its factorization.

9978949620 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 759521 (or 759516 counting only the distinct ones).

The product of its (nonzero) digits is 17635968, while the sum is 63.

The square root of 9978949620 is about 99894.6926518121. The cubic root of 9978949620 is about 2152.9219057483.

The spelling of 9978949620 in words is "nine billion, nine hundred seventy-eight million, nine hundred forty-nine thousand, six hundred twenty".