9978616 has 8 divisors (see below), whose sum is σ = 18709920. Its totient is φ = 4989304.

The previous prime is 9978613. The next prime is 9978637. The reversal of 9978616 is 6168799.

It is a tau number, because it is divible by the number of its divisors (8).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9978613) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 623656 + ... + 623671.

It is an arithmetic number, because the mean of its divisors is an integer number (2338740).

Almost surely, 2^9978616 is an apocalyptic number.

It is an amenable number.

9978616 is a deficient number, since it is larger than the sum of its proper divisors (8731304).

9978616 is a wasteful number, since it uses less digits than its factorization.

9978616 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1247333 (or 1247329 counting only the distinct ones).

The product of its digits is 163296, while the sum is 46.

The square root of 9978616 is about 3158.8947434190. The cubic root of 9978616 is about 215.2897913049.

The spelling of 9978616 in words is "nine million, nine hundred seventy-eight thousand, six hundred sixteen".