9977220 has 72 divisors (see below), whose sum is σ = 33022080. Its totient is φ = 2418240.

The previous prime is 9977213. The next prime is 9977237. The reversal of 9977220 is 227799.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a nialpdrome in base 10.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 540 + ... + 4499.

It is an arithmetic number, because the mean of its divisors is an integer number (458640).

Almost surely, 2^9977220 is an apocalyptic number.

9977220 is a gapful number since it is divisible by the number (90) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 9977220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (16511040).

9977220 is an abundant number, since it is smaller than the sum of its proper divisors (23044860).

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

9977220 is a wasteful number, since it uses less digits than its factorization.

9977220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5065 (or 5060 counting only the distinct ones).

The product of its (nonzero) digits is 15876, while the sum is 36.

The square root of 9977220 is about 3158.6737723291. The cubic root of 9977220 is about 215.2797512163.

The spelling of 9977220 in words is "nine million, nine hundred seventy-seven thousand, two hundred twenty".