7791640 has 32 divisors (see below), whose sum is σ = 17962560. Its totient is φ = 3040000.

The previous prime is 7791629. The next prime is 7791673. The reversal of 7791640 is 461977.

It is a junction number, because it is equal to n+sod(n) for n = 7791596 and 7791605.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 736 + ... + 4015.

It is an arithmetic number, because the mean of its divisors is an integer number (561330).

Almost surely, 2^7791640 is an apocalyptic number.

It is an amenable number.

7791640 is an abundant number, since it is smaller than the sum of its proper divisors (10170920).

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

7791640 is a wasteful number, since it uses less digits than its factorization.

7791640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4803 (or 4799 counting only the distinct ones).

The product of its (nonzero) digits is 10584, while the sum is 34.

The square root of 7791640 is about 2791.3509274185. The cubic root of 7791640 is about 198.2483704221.

The spelling of 7791640 in words is "seven million, seven hundred ninety-one thousand, six hundred forty".