7991136 has 60 divisors (see below), whose sum is σ = 23509332. Its totient is φ = 2662848.

The previous prime is 7991129. The next prime is 7991147. The reversal of 7991136 is 6311997.

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a self number, because there is not a number n which added to its sum of digits gives 7991136.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 1051 + ... + 4133.

Almost surely, 2^7991136 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 7991136, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (11754666).

7991136 is an abundant number, since it is smaller than the sum of its proper divisors (15518196).

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

7991136 is a wasteful number, since it uses less digits than its factorization.

7991136 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3105 (or 3088 counting only the distinct ones).

The product of its digits is 10206, while the sum is 36.

The square root of 7991136 is about 2826.8597418337. The cubic root of 7991136 is about 199.9261060351.

The spelling of 7991136 in words is "seven million, nine hundred ninety-one thousand, one hundred thirty-six".