28113501 has 16 divisors (see below), whose sum is σ = 40751424. Its totient is φ = 17136384.

The previous prime is 28113457. The next prime is 28113523. The reversal of 28113501 is 10531182.

It is not a de Polignac number, because 28113501 - 2¹⁰ = 28112477 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28113571) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 805 + ... + 7541.

It is an arithmetic number, because the mean of its divisors is an integer number (2546964).

Almost surely, 2^28113501 is an apocalyptic number.

It is an amenable number.

28113501 is a deficient number, since it is larger than the sum of its proper divisors (12637923).

28113501 is a wasteful number, since it uses less digits than its factorization.

28113501 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6860.

The product of its (nonzero) digits is 240, while the sum is 21.

The square root of 28113501 is about 5302.2166119464. The cubic root of 28113501 is about 304.0686486530.

Adding to 28113501 its reverse (10531182), we get a palindrome (38644683).

The spelling of 28113501 in words is "twenty-eight million, one hundred thirteen thousand, five hundred one".