7999728 has 80 divisors (see below), whose sum is σ = 22915200. Its totient is φ = 2384640.

The previous prime is 7999727. The next prime is 7999753. The reversal of 7999728 is 8279997.

It is a happy number.

It is a super-3 number, since 3×7999728³ (a number of 22 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7999727) 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, 57483 + ... + 57621.

It is an arithmetic number, because the mean of its divisors is an integer number (286440).

Almost surely, 2^7999728 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 7999728, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (11457600).

7999728 is an abundant number, since it is smaller than the sum of its proper divisors (14915472).

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

7999728 is a wasteful number, since it uses less digits than its factorization.

7999728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 270 (or 264 counting only the distinct ones).

The product of its digits is 571536, while the sum is 51.

The square root of 7999728 is about 2828.3790410764. The cubic root of 7999728 is about 199.9977333076.

The spelling of 7999728 in words is "seven million, nine hundred ninety-nine thousand, seven hundred twenty-eight".