43640928 has 36 divisors (see below), whose sum is σ = 124104708. Its totient is φ = 14546880.

The previous prime is 43640917. The next prime is 43640951. The reversal of 43640928 is 82904634.

It is a happy number.

43640928 is a `hidden beast` number, since 4 + 3 + 640 + 9 + 2 + 8 = 666.

It is a tau number, because it is divible by the number of its divisors (36).

It is a super-3 number, since 3×43640928³ (a number of 24 digits) contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 43640892 and 43640901.

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 5 ways as a sum of consecutive naturals, for example, 75478 + ... + 76053.

It is an arithmetic number, because the mean of its divisors is an integer number (3447353).

Almost surely, 2^43640928 is an apocalyptic number.

43640928 is a gapful number since it is divisible by the number (48) formed by its first and last digit.

It is an amenable number.

43640928 is an abundant number, since it is smaller than the sum of its proper divisors (80463780).

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

43640928 is a wasteful number, since it uses less digits than its factorization.

43640928 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 151547 (or 151536 counting only the distinct ones).

The product of its (nonzero) digits is 41472, while the sum is 36.

The square root of 43640928 is about 6606.1280641538. The cubic root of 43640928 is about 352.0718689341.

The spelling of 43640928 in words is "forty-three million, six hundred forty thousand, nine hundred twenty-eight".