75657691 has 2 divisors, whose sum is σ = 75657692. Its totient is φ = 75657690.

The previous prime is 75657689. The next prime is 75657697. The reversal of 75657691 is 19675657.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 75657691 - 2¹ = 75657689 is a prime.

Together with 75657689, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (75657697) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 37828845 + 37828846.

It is an arithmetic number, because the mean of its divisors is an integer number (37828846).

Almost surely, 2^75657691 is an apocalyptic number.

75657691 is a deficient number, since it is larger than the sum of its proper divisors (1).

75657691 is an equidigital number, since it uses as much as digits as its factorization.

75657691 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 396900, while the sum is 46.

The square root of 75657691 is about 8698.1429627249. The cubic root of 75657691 is about 422.9454536427.

The spelling of 75657691 in words is "seventy-five million, six hundred fifty-seven thousand, six hundred ninety-one".