43978446408 has 128 divisors (see below), whose sum is σ = 122626022400. Its totient is φ = 13050326016.

The previous prime is 43978446403. The next prime is 43978446419. The reversal of 43978446408 is 80464487934.

It is a happy number.

It is a super-2 number, since 2×43978446408² (a number of 22 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (43978446403) 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 31 ways as a sum of consecutive naturals, for example, 9887241 + ... + 9891687.

It is an arithmetic number, because the mean of its divisors is an integer number (958015800).

Almost surely, 2^43978446408 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 43978446408, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (61313011200).

43978446408 is an abundant number, since it is smaller than the sum of its proper divisors (78647575992).

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

43978446408 is a wasteful number, since it uses less digits than its factorization.

43978446408 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5591 (or 5587 counting only the distinct ones).

The product of its (nonzero) digits is 18579456, while the sum is 57.

The spelling of 43978446408 in words is "forty-three billion, nine hundred seventy-eight million, four hundred forty-six thousand, four hundred eight".