7748991 has 12 divisors (see below), whose sum is σ = 11851632. Its totient is φ = 4862016.

The previous prime is 7748981. The next prime is 7749029. The reversal of 7748991 is 1998477.

7748991 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 7748991 - 2⁶ = 7748927 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7748911) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 25171 + ... + 25476.

It is an arithmetic number, because the mean of its divisors is an integer number (987636).

Almost surely, 2^7748991 is an apocalyptic number.

7748991 is a deficient number, since it is larger than the sum of its proper divisors (4102641).

7748991 is a wasteful number, since it uses less digits than its factorization.

7748991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50670 (or 50667 counting only the distinct ones).

The product of its digits is 127008, while the sum is 45.

The square root of 7748991 is about 2783.7009537664. The cubic root of 7748991 is about 197.8859919121.

The spelling of 7748991 in words is "seven million, seven hundred forty-eight thousand, nine hundred ninety-one".