9978672 has 40 divisors (see below), whose sum is σ = 28123200. Its totient is φ = 3023680.

The previous prime is 9978659. The next prime is 9978719. The reversal of 9978672 is 2768799.

It is a Smith number, since the sum of its digits (48) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (48).

It is a nialpdrome in base 16.

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, 8922 + ... + 9977.

It is an arithmetic number, because the mean of its divisors is an integer number (703080).

Almost surely, 2^9978672 is an apocalyptic number.

It is an amenable number.

9978672 is an abundant number, since it is smaller than the sum of its proper divisors (18144528).

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

9978672 is a wasteful number, since it uses less digits than its factorization.

9978672 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18921 (or 18915 counting only the distinct ones).

The product of its digits is 381024, while the sum is 48.

The square root of 9978672 is about 3158.9036072663. The cubic root of 9978672 is about 215.2901940396.

It can be divided in two parts, 997 and 8672, that added together give a palindrome (9669).

The spelling of 9978672 in words is "nine million, nine hundred seventy-eight thousand, six hundred seventy-two".