7998720 has 72 divisors (see below), whose sum is σ = 25558176. Its totient is φ = 2131968.

The previous prime is 7998719. The next prime is 7998743. The reversal of 7998720 is 278997.

It is a congruent number.

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, 2799 + ... + 4881.

Almost surely, 2^7998720 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 7998720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (12779088).

7998720 is an abundant number, since it is smaller than the sum of its proper divisors (17559456).

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

7998720 is a wasteful number, since it uses less digits than its factorization.

7998720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2107 (or 2093 counting only the distinct ones).

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

The square root of 7998720 is about 2828.2008415245. The cubic root of 7998720 is about 199.9893327644.

The spelling of 7998720 in words is "seven million, nine hundred ninety-eight thousand, seven hundred twenty".