43631428 has 12 divisors (see below), whose sum is σ = 78988140. Its totient is φ = 21063392.

The previous prime is 43631381. The next prime is 43631459. The reversal of 43631428 is 82413634.

It can be written as a sum of positive squares in 2 ways, for example, as 18249984 + 25381444 = 4272^2 + 5038^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 43631428.

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 3 ways as a sum of consecutive naturals, for example, 187951 + ... + 188182.

It is an arithmetic number, because the mean of its divisors is an integer number (6582345).

Almost surely, 2^43631428 is an apocalyptic number.

It is an amenable number.

43631428 is a deficient number, since it is larger than the sum of its proper divisors (35356712).

43631428 is a wasteful number, since it uses less digits than its factorization.

43631428 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 376166 (or 376164 counting only the distinct ones).

The product of its digits is 13824, while the sum is 31.

The square root of 43631428 is about 6605.4089956641. The cubic root of 43631428 is about 352.0463200924.

The spelling of 43631428 in words is "forty-three million, six hundred thirty-one thousand, four hundred twenty-eight".