28042506 has 24 divisors (see below), whose sum is σ = 61388964. Its totient is φ = 9250560.

The previous prime is 28042501. The next prime is 28042517. The reversal of 28042506 is 60524082.

It can be written as a sum of positive squares in 2 ways, for example, as 24413481 + 3629025 = 4941^2 + 1905^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 28042506.

It is not an unprimeable number, because it can be changed into a prime (28042501) 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 11 ways as a sum of consecutive naturals, for example, 6285 + ... + 9776.

Almost surely, 2^28042506 is an apocalyptic number.

28042506 is an abundant number, since it is smaller than the sum of its proper divisors (33346458).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

28042506 is a wasteful number, since it uses less digits than its factorization.

28042506 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16166 (or 16163 counting only the distinct ones).

The product of its (nonzero) digits is 3840, while the sum is 27.

The square root of 28042506 is about 5295.5175384470. The cubic root of 28042506 is about 303.8124781301.

Adding to 28042506 its reverse (60524082), we get a palindrome (88566588).

The spelling of 28042506 in words is "twenty-eight million, forty-two thousand, five hundred six".