43664020 has 12 divisors (see below), whose sum is σ = 91694484. Its totient is φ = 17465600.

The previous prime is 43664009. The next prime is 43664063. The reversal of 43664020 is 2046634.

It can be written as a sum of positive squares in 2 ways, for example, as 13060996 + 30603024 = 3614^2 + 5532^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1091581 + ... + 1091620.

It is an arithmetic number, because the mean of its divisors is an integer number (7641207).

Almost surely, 2^43664020 is an apocalyptic number.

It is an amenable number.

43664020 is an abundant number, since it is smaller than the sum of its proper divisors (48030464).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

43664020 is a wasteful number, since it uses less digits than its factorization.

43664020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2183210 (or 2183208 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 25.

The square root of 43664020 is about 6607.8756041560. The cubic root of 43664020 is about 352.1339559888.

The spelling of 43664020 in words is "forty-three million, six hundred sixty-four thousand, twenty".