28421513 has 16 divisors (see below), whose sum is σ = 30643200. Its totient is φ = 26308800.

The previous prime is 28421443. The next prime is 28421531. The reversal of 28421513 is 31512482.

It is a cyclic number.

It is not a de Polignac number, because 28421513 - 2⁸ = 28421257 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28421213) 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 15 ways as a sum of consecutive naturals, for example, 81263 + ... + 81611.

It is an arithmetic number, because the mean of its divisors is an integer number (1915200).

Almost surely, 2^28421513 is an apocalyptic number.

It is an amenable number.

28421513 is a deficient number, since it is larger than the sum of its proper divisors (2221687).

28421513 is a wasteful number, since it uses less digits than its factorization.

28421513 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 488.

The product of its digits is 1920, while the sum is 26.

The square root of 28421513 is about 5331.1830769539. The cubic root of 28421513 is about 305.1750781966.

Adding to 28421513 its reverse (31512482), we get a palindrome (59933995).

The spelling of 28421513 in words is "twenty-eight million, four hundred twenty-one thousand, five hundred thirteen".