43728436 has 6 divisors (see below), whose sum is σ = 76524770. Its totient is φ = 21864216.

The previous prime is 43728431. The next prime is 43728457. The reversal of 43728436 is 63482734.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 35283600 + 8444836 = 5940^2 + 2906^2 .

It is a super-2 number, since 2×43728436² = 3824352230012192, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 43728395 and 43728404.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (43728431) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5466051 + ... + 5466058.

Almost surely, 2^43728436 is an apocalyptic number.

It is an amenable number.

43728436 is a deficient number, since it is larger than the sum of its proper divisors (32796334).

43728436 is a wasteful number, since it uses less digits than its factorization.

43728436 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10932113 (or 10932111 counting only the distinct ones).

The product of its digits is 96768, while the sum is 37.

The square root of 43728436 is about 6612.7479915690. The cubic root of 43728436 is about 352.3070345367.

The spelling of 43728436 in words is "forty-three million, seven hundred twenty-eight thousand, four hundred thirty-six".