9978650 has 24 divisors (see below), whose sum is σ = 20248704. Its totient is φ = 3628400.

The previous prime is 9978649. The next prime is 9978653. The reversal of 9978650 is 568799.

It is not an unprimeable number, because it can be changed into a prime (9978653) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 8522 + ... + 9621.

It is an arithmetic number, because the mean of its divisors is an integer number (843696).

Almost surely, 2^9978650 is an apocalyptic number.

9978650 is an abundant number, since it is smaller than the sum of its proper divisors (10270054).

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

9978650 is a wasteful number, since it uses less digits than its factorization.

9978650 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18166 (or 18161 counting only the distinct ones).

The product of its (nonzero) digits is 136080, while the sum is 44.

The square root of 9978650 is about 3158.9001250435. The cubic root of 9978650 is about 215.2900358226.

The spelling of 9978650 in words is "nine million, nine hundred seventy-eight thousand, six hundred fifty".