43720640 has 56 divisors (see below), whose sum is σ = 104680512. Its totient is φ = 17392640.

The previous prime is 43720619. The next prime is 43720657. The reversal of 43720640 is 4602734.

It is a happy number.

43720640 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×43720640² = 3822988724019200, which contains 22 as substring.

It is a hoax number, since the sum of its digits (26) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 101225 + ... + 101655.

Almost surely, 2^43720640 is an apocalyptic number.

43720640 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 43720640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (52340256).

43720640 is an abundant number, since it is smaller than the sum of its proper divisors (60959872).

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

43720640 is a wasteful number, since it uses less digits than its factorization.

43720640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 765 (or 755 counting only the distinct ones).

The product of its (nonzero) digits is 4032, while the sum is 26.

The square root of 43720640 is about 6612.1584977978. The cubic root of 43720640 is about 352.2860966061.

The spelling of 43720640 in words is "forty-three million, seven hundred twenty thousand, six hundred forty".