28052505 has 48 divisors (see below), whose sum is σ = 53114880. Its totient is φ = 13613184.

The previous prime is 28052503. The next prime is 28052509. The reversal of 28052505 is 50525082.

It is not a de Polignac number, because 28052505 - 2¹ = 28052503 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28052503) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 45912 + ... + 46518.

It is an arithmetic number, because the mean of its divisors is an integer number (1106560).

Almost surely, 2^28052505 is an apocalyptic number.

It is an amenable number.

28052505 is a deficient number, since it is larger than the sum of its proper divisors (25062375).

28052505 is a wasteful number, since it uses less digits than its factorization.

28052505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 710 (or 707 counting only the distinct ones).

The product of its (nonzero) digits is 4000, while the sum is 27.

The square root of 28052505 is about 5296.4615546608. The cubic root of 28052505 is about 303.8485835573.

Adding to 28052505 its reverse (50525082), we get a palindrome (78577587).

The spelling of 28052505 in words is "twenty-eight million, fifty-two thousand, five hundred five".