75646681 has 12 divisors (see below), whose sum is σ = 84606192. Its totient is φ = 67076000.

The previous prime is 75646663. The next prime is 75646691. The reversal of 75646681 is 18664657.

It is a happy number.

It is not a de Polignac number, because 75646681 - 2¹³ = 75638489 is a prime.

It is a super-2 number, since 2×75646681² = 11444840692631522, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (75646691) by changing a digit.

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 11 ways as a sum of consecutive naturals, for example, 16446 + ... + 20536.

It is an arithmetic number, because the mean of its divisors is an integer number (7050516).

Almost surely, 2^75646681 is an apocalyptic number.

It is an amenable number.

75646681 is a deficient number, since it is larger than the sum of its proper divisors (8959511).

75646681 is a wasteful number, since it uses less digits than its factorization.

75646681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4184 (or 4143 counting only the distinct ones).

The product of its digits is 241920, while the sum is 43.

The square root of 75646681 is about 8697.5100459844. The cubic root of 75646681 is about 422.9249364277.

The spelling of 75646681 in words is "seventy-five million, six hundred forty-six thousand, six hundred eighty-one".