43664999828 has 6 divisors (see below), whose sum is σ = 76413749706. Its totient is φ = 21832499912.

The previous prime is 43664999827. The next prime is 43664999867. The reversal of 43664999828 is 82899946634.

It can be written as a sum of positive squares in only one way, i.e., 42338000644 + 1326999184 = 205762^2 + 36428^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (43664999827) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5458124975 + ... + 5458124982.

It is an arithmetic number, because the mean of its divisors is an integer number (12735624951).

Almost surely, 2^43664999828 is an apocalyptic number.

It is an amenable number.

43664999828 is a deficient number, since it is larger than the sum of its proper divisors (32748749878).

43664999828 is a wasteful number, since it uses less digits than its factorization.

43664999828 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10916249961 (or 10916249959 counting only the distinct ones).

The product of its digits is 161243136, while the sum is 68.

The spelling of 43664999828 in words is "forty-three billion, six hundred sixty-four million, nine hundred ninety-nine thousand, eight hundred twenty-eight".