43664525 has 6 divisors (see below), whose sum is σ = 54144042. Its totient is φ = 34931600.

The previous prime is 43664521. The next prime is 43664539. The reversal of 43664525 is 52546634.

It is a happy number.

It can be written as a sum of positive squares in 3 ways, for example, as 866761 + 42797764 = 931^2 + 6542^2 .

It is not a de Polignac number, because 43664525 - 2² = 43664521 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 (43664521) 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 5 ways as a sum of consecutive naturals, for example, 873266 + ... + 873315.

It is an arithmetic number, because the mean of its divisors is an integer number (9024007).

Almost surely, 2^43664525 is an apocalyptic number.

It is an amenable number.

43664525 is a deficient number, since it is larger than the sum of its proper divisors (10479517).

43664525 is a wasteful number, since it uses less digits than its factorization.

43664525 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1746591 (or 1746586 counting only the distinct ones).

The product of its digits is 86400, while the sum is 35.

The square root of 43664525 is about 6607.9138160239. The cubic root of 43664525 is about 352.1353135288.

The spelling of 43664525 in words is "forty-three million, six hundred sixty-four thousand, five hundred twenty-five".