9978564 has 12 divisors (see below), whose sum is σ = 23283344. Its totient is φ = 3326184.

The previous prime is 9978557. The next prime is 9978583. The reversal of 9978564 is 4658799.

It is a tau number, because it is divible by the number of its divisors (12).

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 415762 + ... + 415785.

Almost surely, 2^9978564 is an apocalyptic number.

It is an amenable number.

9978564 is an abundant number, since it is smaller than the sum of its proper divisors (13304780).

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

9978564 is a wasteful number, since it uses less digits than its factorization.

9978564 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 831554 (or 831552 counting only the distinct ones).

The product of its digits is 544320, while the sum is 48.

The square root of 9978564 is about 3158.8865126813. The cubic root of 9978564 is about 215.2894173356.

The spelling of 9978564 in words is "nine million, nine hundred seventy-eight thousand, five hundred sixty-four".