7528660991 has 4 divisors (see below), whose sum is σ = 7541357472. Its totient is φ = 7515964512.

The previous prime is 7528660973. The next prime is 7528661017. The reversal of 7528660991 is 1990668257.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-7528660991 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7528660901) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6347351 + ... + 6348536.

It is an arithmetic number, because the mean of its divisors is an integer number (1885339368).

Almost surely, 2^7528660991 is an apocalyptic number.

7528660991 is a deficient number, since it is larger than the sum of its proper divisors (12696481).

7528660991 is a wasteful number, since it uses less digits than its factorization.

7528660991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12696480.

The product of its (nonzero) digits is 1632960, while the sum is 53.

The square root of 7528660991 is about 86767.8568998912. The cubic root of 7528660991 is about 1959.9240730514.

The spelling of 7528660991 in words is "seven billion, five hundred twenty-eight million, six hundred sixty thousand, nine hundred ninety-one".