43664534 has 16 divisors (see below), whose sum is σ = 72366048. Its totient is φ = 19654272.

The previous prime is 43664521. The next prime is 43664539. The reversal of 43664534 is 43546634.

It is a junction number, because it is equal to n+sod(n) for n = 43664494 and 43664503.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (43664539) 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 7 ways as a sum of consecutive naturals, for example, 27137 + ... + 28700.

It is an arithmetic number, because the mean of its divisors is an integer number (4522878).

Almost surely, 2^43664534 is an apocalyptic number.

43664534 is a deficient number, since it is larger than the sum of its proper divisors (28701514).

43664534 is a wasteful number, since it uses less digits than its factorization.

43664534 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55879.

The product of its digits is 103680, while the sum is 35.

The square root of 43664534 is about 6607.9144970255. The cubic root of 43664534 is about 352.1353377225.

The spelling of 43664534 in words is "forty-three million, six hundred sixty-four thousand, five hundred thirty-four".