75644689 has 4 divisors (see below), whose sum is σ = 75903156. Its totient is φ = 75386224.

The previous prime is 75644671. The next prime is 75644693. The reversal of 75644689 is 98644657.

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

It can be written as a sum of positive squares in 2 ways, for example, as 43665664 + 31979025 = 6608^2 + 5655^2 .

It is a cyclic number.

It is not a de Polignac number, because 75644689 - 2¹⁷ = 75513617 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (75644659) 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 3 ways as a sum of consecutive naturals, for example, 128794 + ... + 129379.

It is an arithmetic number, because the mean of its divisors is an integer number (18975789).

Almost surely, 2^75644689 is an apocalyptic number.

It is an amenable number.

75644689 is a deficient number, since it is larger than the sum of its proper divisors (258467).

75644689 is a wasteful number, since it uses less digits than its factorization.

75644689 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 258466.

The product of its digits is 1451520, while the sum is 49.

The square root of 75644689 is about 8697.3955296974. The cubic root of 75644689 is about 422.9212241085.

The spelling of 75644689 in words is "seventy-five million, six hundred forty-four thousand, six hundred eighty-nine".