28662505 has 4 divisors (see below), whose sum is σ = 34395012. Its totient is φ = 22930000.

The previous prime is 28662481. The next prime is 28662509. The reversal of 28662505 is 50526682.

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 16883881 + 11778624 = 4109^2 + 3432^2 .

It is not a de Polignac number, because 28662505 - 2¹³ = 28654313 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28662509) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2866246 + ... + 2866255.

It is an arithmetic number, because the mean of its divisors is an integer number (8598753).

Almost surely, 2^28662505 is an apocalyptic number.

It is an amenable number.

28662505 is a deficient number, since it is larger than the sum of its proper divisors (5732507).

28662505 is an equidigital number, since it uses as much as digits as its factorization.

28662505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5732506.

The product of its (nonzero) digits is 28800, while the sum is 34.

The square root of 28662505 is about 5353.7374795558. The cubic root of 28662505 is about 306.0351996474.

The spelling of 28662505 in words is "twenty-eight million, six hundred sixty-two thousand, five hundred five".