28124501 has 4 divisors (see below), whose sum is σ = 28140000. Its totient is φ = 28109004.

The previous prime is 28124497. The next prime is 28124527. The reversal of 28124501 is 10542182.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 28124501 - 2² = 28124497 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28124581) 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 3 ways as a sum of consecutive naturals, for example, 4601 + ... + 8798.

It is an arithmetic number, because the mean of its divisors is an integer number (7035000).

Almost surely, 2^28124501 is an apocalyptic number.

It is an amenable number.

28124501 is a deficient number, since it is larger than the sum of its proper divisors (15499).

28124501 is a wasteful number, since it uses less digits than its factorization.

28124501 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15498.

The product of its (nonzero) digits is 640, while the sum is 23.

The square root of 28124501 is about 5303.2538125193. The cubic root of 28124501 is about 304.1083012384.

Adding to 28124501 its reverse (10542182), we get a palindrome (38666683).

The spelling of 28124501 in words is "twenty-eight million, one hundred twenty-four thousand, five hundred one".