28769513 has 4 divisors (see below), whose sum is σ = 29312388. Its totient is φ = 28226640.

The previous prime is 28769473. The next prime is 28769539. The reversal of 28769513 is 31596782.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 20313049 + 8456464 = 4507^2 + 2908^2 .

It is a cyclic number.

It is not a de Polignac number, because 28769513 - 2⁶ = 28769449 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28769563) 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 3 ways as a sum of consecutive naturals, for example, 271358 + ... + 271463.

It is an arithmetic number, because the mean of its divisors is an integer number (7328097).

Almost surely, 2^28769513 is an apocalyptic number.

It is an amenable number.

28769513 is a deficient number, since it is larger than the sum of its proper divisors (542875).

28769513 is an equidigital number, since it uses as much as digits as its factorization.

28769513 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 542874.

The product of its digits is 90720, while the sum is 41.

The square root of 28769513 is about 5363.7219353729. The cubic root of 28769513 is about 306.4155751603.

The spelling of 28769513 in words is "twenty-eight million, seven hundred sixty-nine thousand, five hundred thirteen".