75565664 has 12 divisors (see below), whose sum is σ = 148769964. Its totient is φ = 37782816.

The previous prime is 75565639. The next prime is 75565669. The reversal of 75565664 is 46656557.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (75565669) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1180682 + ... + 1180745.

It is an arithmetic number, because the mean of its divisors is an integer number (12397497).

Almost surely, 2^75565664 is an apocalyptic number.

It is an amenable number.

75565664 is a deficient number, since it is larger than the sum of its proper divisors (73204300).

75565664 is a wasteful number, since it uses less digits than its factorization.

75565664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2361437 (or 2361429 counting only the distinct ones).

The product of its digits is 756000, while the sum is 44.

The square root of 75565664 is about 8692.8513158802. The cubic root of 75565664 is about 422.7738994022.

Adding to 75565664 its reverse (46656557), we get a palindrome (122222221).

The spelling of 75565664 in words is "seventy-five million, five hundred sixty-five thousand, six hundred sixty-four".