28470945 has 32 divisors (see below), whose sum is σ = 47912832. Its totient is φ = 14418432.

The previous prime is 28470931. The next prime is 28470947. The reversal of 28470945 is 54907482.

It is not a de Polignac number, because 28470945 - 2⁷ = 28470817 is a prime.

It is a Smith number, since the sum of its digits (39) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (28470947) by changing a digit.

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 31 ways as a sum of consecutive naturals, for example, 23269 + ... + 24461.

It is an arithmetic number, because the mean of its divisors is an integer number (1497276).

Almost surely, 2^28470945 is an apocalyptic number.

It is an amenable number.

28470945 is a deficient number, since it is larger than the sum of its proper divisors (19441887).

28470945 is a wasteful number, since it uses less digits than its factorization.

28470945 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1281.

The product of its (nonzero) digits is 80640, while the sum is 39.

The square root of 28470945 is about 5335.8171820256. The cubic root of 28470945 is about 305.3519005583.

The spelling of 28470945 in words is "twenty-eight million, four hundred seventy thousand, nine hundred forty-five".