43820640 has 72 divisors (see below), whose sum is σ = 149542848. Its totient is φ = 11685120.

The previous prime is 43820603. The next prime is 43820671. The reversal of 43820640 is 4602834.

It is a tau number, because it is divible by the number of its divisors (72).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 13776 + ... + 16655.

It is an arithmetic number, because the mean of its divisors is an integer number (2076984).

Almost surely, 2^43820640 is an apocalyptic number.

43820640 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

43820640 is an abundant number, since it is smaller than the sum of its proper divisors (105722208).

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

43820640 is a wasteful number, since it uses less digits than its factorization.

43820640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30452 (or 30441 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 27.

The square root of 43820640 is about 6619.7160059930. The cubic root of 43820640 is about 352.5544807901.

The spelling of 43820640 in words is "forty-three million, eight hundred twenty thousand, six hundred forty".