43720855920 has 320 divisors, whose sum is σ = 181166976000. Its totient is φ = 9467311104.

The previous prime is 43720855907. The next prime is 43720855949. The reversal of 43720855920 is 2955802734.

43720855920 is a `hidden beast` number, since 4 + 3 + 72 + 0 + 8 + 559 + 20 = 666.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 211186 + ... + 363374.

It is an arithmetic number, because the mean of its divisors is an integer number (566146800).

Almost surely, 2^43720855920 is an apocalyptic number.

43720855920 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 43720855920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (90583488000).

43720855920 is an abundant number, since it is smaller than the sum of its proper divisors (137446120080).

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

43720855920 is a wasteful number, since it uses less digits than its factorization.

43720855920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 152237 (or 152225 counting only the distinct ones).

The product of its (nonzero) digits is 604800, while the sum is 45.

The spelling of 43720855920 in words is "forty-three billion, seven hundred twenty million, eight hundred fifty-five thousand, nine hundred twenty".