28570047 has 32 divisors (see below), whose sum is σ = 44457984. Its totient is φ = 16128000.

The previous prime is 28570039. The next prime is 28570063. The reversal of 28570047 is 74007582.

It is not a de Polignac number, because 28570047 - 2³ = 28570039 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28570007) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 71047 + ... + 71447.

It is an arithmetic number, because the mean of its divisors is an integer number (1389312).

Almost surely, 2^28570047 is an apocalyptic number.

28570047 is a deficient number, since it is larger than the sum of its proper divisors (15887937).

28570047 is a wasteful number, since it uses less digits than its factorization.

28570047 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 559.

The product of its (nonzero) digits is 15680, while the sum is 33.

The square root of 28570047 is about 5345.0956025126. The cubic root of 28570047 is about 305.7057811063.

It can be divided in two parts, 28 and 570047, that added together give a palindrome (570075).

The spelling of 28570047 in words is "twenty-eight million, five hundred seventy thousand, forty-seven".