75644621 has 8 divisors (see below), whose sum is σ = 83001240. Its totient is φ = 68507712.

The previous prime is 75644603. The next prime is 75644627. The reversal of 75644621 is 12644657.

It can be written as a sum of positive squares in 4 ways, for example, as 8584900 + 67059721 = 2930^2 + 8189^2 .

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

It is not a de Polignac number, because 75644621 - 2¹⁴ = 75628237 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 (75644627) 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 in 7 ways as a sum of consecutive naturals, for example, 54206 + ... + 55583.

It is an arithmetic number, because the mean of its divisors is an integer number (10375155).

Almost surely, 2^75644621 is an apocalyptic number.

It is an amenable number.

75644621 is a deficient number, since it is larger than the sum of its proper divisors (7356619).

75644621 is a wasteful number, since it uses less digits than its factorization.

75644621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 109855.

The product of its digits is 40320, while the sum is 35.

The square root of 75644621 is about 8697.3916204802. The cubic root of 75644621 is about 422.9210973816.

The spelling of 75644621 in words is "seventy-five million, six hundred forty-four thousand, six hundred twenty-one".