75644645 has 8 divisors (see below), whose sum is σ = 96113304. Its totient is φ = 56955904.

The previous prime is 75644627. The next prime is 75644659. The reversal of 75644645 is 54644657.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 30459361 + 45185284 = 5519^2 + 6722^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 75644645 - 2⁶ = 75644581 is a prime.

It is a super-2 number, since 2×75644645² = 11444224634352050, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

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 in 7 ways as a sum of consecutive naturals, for example, 444884 + ... + 445053.

It is an arithmetic number, because the mean of its divisors is an integer number (12014163).

Almost surely, 2^75644645 is an apocalyptic number.

It is an amenable number.

75644645 is a deficient number, since it is larger than the sum of its proper divisors (20468659).

75644645 is a wasteful number, since it uses less digits than its factorization.

75644645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 889959.

The product of its digits is 403200, while the sum is 41.

The square root of 75644645 is about 8697.3930002041. The cubic root of 75644645 is about 422.9211421087.

The spelling of 75644645 in words is "seventy-five million, six hundred forty-four thousand, six hundred forty-five".