28923015 has 16 divisors (see below), whose sum is σ = 50484096. Its totient is φ = 14023200.

The previous prime is 28922987. The next prime is 28923019. The reversal of 28923015 is 51032982.

It is a happy number.

It is not a de Polignac number, because 28923015 - 2⁸ = 28922759 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28923019) 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 15 ways as a sum of consecutive naturals, for example, 87481 + ... + 87810.

It is an arithmetic number, because the mean of its divisors is an integer number (3155256).

Almost surely, 2^28923015 is an apocalyptic number.

28923015 is a deficient number, since it is larger than the sum of its proper divisors (21561081).

28923015 is a wasteful number, since it uses less digits than its factorization.

28923015 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 175310.

The product of its (nonzero) digits is 4320, while the sum is 30.

The square root of 28923015 is about 5378.0121792350. The cubic root of 28923015 is about 306.9595769190.

Adding to 28923015 its reverse (51032982), we get a palindrome (79955997).

The spelling of 28923015 in words is "twenty-eight million, nine hundred twenty-three thousand, fifteen".