7991320 has 16 divisors (see below), whose sum is σ = 17980560. Its totient is φ = 3196512.

The previous prime is 7991311. The next prime is 7991329. The reversal of 7991320 is 231997.

It is an interprime number because it is at equal distance from previous prime (7991311) and next prime (7991329).

It is a super-2 number, since 2×7991320² = 127722390684800, which contains 22 as substring.

It is a zygodrome in base 2.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7991329) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 99852 + ... + 99931.

It is an arithmetic number, because the mean of its divisors is an integer number (1123785).

Almost surely, 2^7991320 is an apocalyptic number.

It is an amenable number.

7991320 is an abundant number, since it is smaller than the sum of its proper divisors (9989240).

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

7991320 is a wasteful number, since it uses less digits than its factorization.

7991320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 199794 (or 199790 counting only the distinct ones).

The product of its (nonzero) digits is 3402, while the sum is 31.

The square root of 7991320 is about 2826.8922865932. The cubic root of 7991320 is about 199.9276404903.

The spelling of 7991320 in words is "seven million, nine hundred ninety-one thousand, three hundred twenty".