43172728 has 8 divisors (see below), whose sum is σ = 80948880. Its totient is φ = 21586360.

The previous prime is 43172641. The next prime is 43172729. The reversal of 43172728 is 82727134.

It is a tau number, because it is divible by the number of its divisors (8).

It is a junction number, because it is equal to n+sod(n) for n = 43172693 and 43172702.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (43172729) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2698288 + ... + 2698303.

It is an arithmetic number, because the mean of its divisors is an integer number (10118610).

Almost surely, 2^43172728 is an apocalyptic number.

It is an amenable number.

43172728 is a deficient number, since it is larger than the sum of its proper divisors (37776152).

43172728 is a wasteful number, since it uses less digits than its factorization.

43172728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5396597 (or 5396593 counting only the distinct ones).

The product of its digits is 18816, while the sum is 34.

The square root of 43172728 is about 6570.5957111970. The cubic root of 43172728 is about 350.8082761797.

The spelling of 43172728 in words is "forty-three million, one hundred seventy-two thousand, seven hundred twenty-eight".