28053815 has 4 divisors (see below), whose sum is σ = 33664584. Its totient is φ = 22443048.

The previous prime is 28053787. The next prime is 28053821. The reversal of 28053815 is 51835082.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 28053815 - 2¹⁴ = 28037431 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2805377 + ... + 2805386.

It is an arithmetic number, because the mean of its divisors is an integer number (8416146).

Almost surely, 2^28053815 is an apocalyptic number.

28053815 is a deficient number, since it is larger than the sum of its proper divisors (5610769).

28053815 is an equidigital number, since it uses as much as digits as its factorization.

28053815 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5610768.

The product of its (nonzero) digits is 9600, while the sum is 32.

The square root of 28053815 is about 5296.5852206870. The cubic root of 28053815 is about 303.8533132056.

Adding to 28053815 its reverse (51835082), we get a palindrome (79888897).

The spelling of 28053815 in words is "twenty-eight million, fifty-three thousand, eight hundred fifteen".