43661628 has 36 divisors (see below), whose sum is σ = 113353240. Its totient is φ = 14160096.

The previous prime is 43661603. The next prime is 43661633. The reversal of 43661628 is 82616634.

43661628 is a `hidden beast` number, since 4 + 36 + 616 + 2 + 8 = 666.

43661628 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (36).

It is a super-2 number, since 2×43661628² = 3812675519220768, which contains 22 as substring.

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 = 43661592 and 43661601.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 15058 + ... + 17721.

Almost surely, 2^43661628 is an apocalyptic number.

It is an amenable number.

43661628 is an abundant number, since it is smaller than the sum of its proper divisors (69691612).

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

43661628 is a wasteful number, since it uses less digits than its factorization.

43661628 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32826 (or 32821 counting only the distinct ones).

The product of its digits is 41472, while the sum is 36.

The square root of 43661628 is about 6607.6946055338. The cubic root of 43661628 is about 352.1275256769.

The spelling of 43661628 in words is "forty-three million, six hundred sixty-one thousand, six hundred twenty-eight".