43980800656 has 135 divisors (see below), whose sum is σ = 95711094801. Its totient is φ = 19569019392.

The previous prime is 43980800653. The next prime is 43980800683. The reversal of 43980800656 is 65600808934.

It is a happy number.

The square root of 43980800656 is 209716.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in 13 ways, for example, as 10798535056 + 33182265600 = 103916^2 + 182160^2 .

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (43980800653) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 403493530 + ... + 403493638.

Almost surely, 2^43980800656 is an apocalyptic number.

43980800656 is the 209716-th square number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 43980800656

43980800656 is an abundant number, since it is smaller than the sum of its proper divisors (51730294145).

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

43980800656 is a wasteful number, since it uses less digits than its factorization.

43980800656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 326 (or 161 counting only the distinct ones).

The product of its (nonzero) digits is 1244160, while the sum is 49.

Multiplying 43980800656 by its sum of digits (49), we get a square (2155059232144 = 1468012²).

The spelling of 43980800656 in words is "forty-three billion, nine hundred eighty million, eight hundred thousand, six hundred fifty-six".