28489513 has 12 divisors (see below), whose sum is σ = 31918860. Its totient is φ = 25386816.

The previous prime is 28489471. The next prime is 28489537. The reversal of 28489513 is 31598482.

It can be written as a sum of positive squares in 6 ways, for example, as 2152089 + 26337424 = 1467^2 + 5132^2 .

It is not a de Polignac number, because 28489513 - 2¹⁷ = 28358441 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28489583) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1995 + ... + 7807.

It is an arithmetic number, because the mean of its divisors is an integer number (2659905).

Almost surely, 2^28489513 is an apocalyptic number.

It is an amenable number.

28489513 is a deficient number, since it is larger than the sum of its proper divisors (3429347).

28489513 is a wasteful number, since it uses less digits than its factorization.

28489513 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5868 (or 5855 counting only the distinct ones).

The product of its digits is 69120, while the sum is 40.

The square root of 28489513 is about 5337.5568381049. The cubic root of 28489513 is about 305.4182669537.

The spelling of 28489513 in words is "twenty-eight million, four hundred eighty-nine thousand, five hundred thirteen".