9978280 has 64 divisors (see below), whose sum is σ = 24998400. Its totient is φ = 3559680.

The previous prime is 9978277. The next prime is 9978281. The reversal of 9978280 is 828799.

It is not an unprimeable number, because it can be changed into a prime (9978281) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 15811 + ... + 16429.

It is an arithmetic number, because the mean of its divisors is an integer number (390600).

Almost surely, 2^9978280 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 9978280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (12499200).

9978280 is an abundant number, since it is smaller than the sum of its proper divisors (15020120).

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

9978280 is a wasteful number, since it uses less digits than its factorization.

9978280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 674 (or 670 counting only the distinct ones).

The product of its (nonzero) digits is 72576, while the sum is 43.

The square root of 9978280 is about 3158.8415598127. The cubic root of 9978280 is about 215.2873748649.

The spelling of 9978280 in words is "nine million, nine hundred seventy-eight thousand, two hundred eighty".