28480505 has 4 divisors (see below), whose sum is σ = 34176612. Its totient is φ = 22784400.

The previous prime is 28480493. The next prime is 28480513. The reversal of 28480505 is 50508482.

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 3759721 + 24720784 = 1939^2 + 4972^2 .

It is a de Polignac number, because none of the positive numbers 2^k-28480505 is a prime.

It is a super-2 number, since 2×28480505² = 1622278330110050, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon 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, 2848046 + ... + 2848055.

It is an arithmetic number, because the mean of its divisors is an integer number (8544153).

Almost surely, 2^28480505 is an apocalyptic number.

It is an amenable number.

28480505 is a deficient number, since it is larger than the sum of its proper divisors (5696107).

28480505 is an equidigital number, since it uses as much as digits as its factorization.

28480505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5696106.

The product of its (nonzero) digits is 12800, while the sum is 32.

The square root of 28480505 is about 5336.7129396287. The cubic root of 28480505 is about 305.3860738473.

Adding to 28480505 its reverse (50508482), we get a palindrome (78988987).

The spelling of 28480505 in words is "twenty-eight million, four hundred eighty thousand, five hundred five".