28670443 has 16 divisors (see below), whose sum is σ = 31334400. Its totient is φ = 26151840.

The previous prime is 28670429. The next prime is 28670459. The reversal of 28670443 is 34407682.

It is a cyclic number.

It is not a de Polignac number, because 28670443 - 2²¹ = 26573291 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 28670399 and 28670408.

It is not an unprimeable number, because it can be changed into a prime (28670413) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 56073 + ... + 56581.

It is an arithmetic number, because the mean of its divisors is an integer number (1958400).

Almost surely, 2^28670443 is an apocalyptic number.

28670443 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

28670443 is a deficient number, since it is larger than the sum of its proper divisors (2663957).

28670443 is a wasteful number, since it uses less digits than its factorization.

28670443 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 642.

The product of its (nonzero) digits is 32256, while the sum is 34.

The square root of 28670443 is about 5354.4787794892. The cubic root of 28670443 is about 306.0634489018.

The spelling of 28670443 in words is "twenty-eight million, six hundred seventy thousand, four hundred forty-three".