28874645 has 8 divisors (see below), whose sum is σ = 34968120. Its totient is φ = 22887360.

The previous prime is 28874641. The next prime is 28874647. The reversal of 28874645 is 54647882.

It can be written as a sum of positive squares in 4 ways, for example, as 14182756 + 14691889 = 3766^2 + 3833^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 28874645 - 2² = 28874641 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 28874596 and 28874605.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28874641) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 25946 + ... + 27035.

It is an arithmetic number, because the mean of its divisors is an integer number (4371015).

Almost surely, 2^28874645 is an apocalyptic number.

It is an amenable number.

28874645 is a deficient number, since it is larger than the sum of its proper divisors (6093475).

28874645 is a wasteful number, since it uses less digits than its factorization.

28874645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53095.

The product of its digits is 430080, while the sum is 44.

The square root of 28874645 is about 5373.5132827602. The cubic root of 28874645 is about 306.7883647160.

The spelling of 28874645 in words is "twenty-eight million, eight hundred seventy-four thousand, six hundred forty-five".