43031728 has 10 divisors (see below), whose sum is σ = 83374004. Its totient is φ = 21515856.

The previous prime is 43031701. The next prime is 43031741. The reversal of 43031728 is 82713034.

It is a super-2 number, since 2×43031728² = 3703459229331968, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 43031696 and 43031705.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1344726 + ... + 1344757.

Almost surely, 2^43031728 is an apocalyptic number.

It is an amenable number.

43031728 is a deficient number, since it is larger than the sum of its proper divisors (40342276).

43031728 is a wasteful number, since it uses less digits than its factorization.

43031728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2689491 (or 2689485 counting only the distinct ones).

The product of its (nonzero) digits is 4032, while the sum is 28.

The square root of 43031728 is about 6559.8573155214. The cubic root of 43031728 is about 350.4259521516.

The spelling of 43031728 in words is "forty-three million, thirty-one thousand, seven hundred twenty-eight".