43781328 has 60 divisors (see below), whose sum is σ = 127863840. Its totient is φ = 13958208.

The previous prime is 43781327. The next prime is 43781359. The reversal of 43781328 is 82318734.

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 = 43781292 and 43781301.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (43781321) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3298 + ... + 9921.

It is an arithmetic number, because the mean of its divisors is an integer number (2131064).

Almost surely, 2^43781328 is an apocalyptic number.

43781328 is a gapful number since it is divisible by the number (48) formed by its first and last digit.

It is an amenable number.

43781328 is an abundant number, since it is smaller than the sum of its proper divisors (84082512).

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

43781328 is a wasteful number, since it uses less digits than its factorization.

43781328 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13256 (or 13247 counting only the distinct ones).

The product of its digits is 32256, while the sum is 36.

The square root of 43781328 is about 6616.7460280715. The cubic root of 43781328 is about 352.4490223550.

The spelling of 43781328 in words is "forty-three million, seven hundred eighty-one thousand, three hundred twenty-eight".