7991128 has 32 divisors (see below), whose sum is σ = 15629760. Its totient is φ = 3827200.

The previous prime is 7991119. The next prime is 7991129. The reversal of 7991128 is 8211997.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7991129) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 19728 + ... + 20128.

It is an arithmetic number, because the mean of its divisors is an integer number (488430).

Almost surely, 2^7991128 is an apocalyptic number.

It is an amenable number.

7991128 is a deficient number, since it is larger than the sum of its proper divisors (7638632).

7991128 is a wasteful number, since it uses less digits than its factorization.

7991128 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 507 (or 503 counting only the distinct ones).

The product of its digits is 9072, while the sum is 37.

The square root of 7991128 is about 2826.8583268356. The cubic root of 7991128 is about 199.9260393191.

The spelling of 7991128 in words is "seven million, nine hundred ninety-one thousand, one hundred twenty-eight".