8997720 has 64 divisors (see below), whose sum is σ = 27306720. Its totient is φ = 2371584.

The previous prime is 8997713. The next prime is 8997721. The reversal of 8997720 is 277998.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8997721) 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, 11254 + ... + 12026.

Almost surely, 2^8997720 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 8997720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (13653360).

8997720 is an abundant number, since it is smaller than the sum of its proper divisors (18309000).

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

8997720 is a wasteful number, since it uses less digits than its factorization.

8997720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 884 (or 880 counting only the distinct ones).

The product of its (nonzero) digits is 63504, while the sum is 42.

The square root of 8997720 is about 2999.6199759303. The cubic root of 8997720 is about 207.9908156694.

The spelling of 8997720 in words is "eight million, nine hundred ninety-seven thousand, seven hundred twenty".