9978578 has 16 divisors (see below), whose sum is σ = 15348960. Its totient is φ = 4863936.

The previous prime is 9978557. The next prime is 9978583. The reversal of 9978578 is 8758799.

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, 14813 + ... + 15471.

It is an arithmetic number, because the mean of its divisors is an integer number (959310).

Almost surely, 2^9978578 is an apocalyptic number.

9978578 is a deficient number, since it is larger than the sum of its proper divisors (5370382).

9978578 is a wasteful number, since it uses less digits than its factorization.

9978578 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 841.

The product of its digits is 1270080, while the sum is 53.

The square root of 9978578 is about 3158.8887286513. Note that the first 3 decimals coincide. The cubic root of 9978578 is about 215.2895180198.

The spelling of 9978578 in words is "nine million, nine hundred seventy-eight thousand, five hundred seventy-eight".