28501 has 4 divisors (see below), whose sum is σ = 31104. Its totient is φ = 25900.

The previous prime is 28499. The next prime is 28513. The reversal of 28501 is 10582.

It is a happy number.

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 28501 - 2¹ = 28499 is a prime.

It is a Duffinian number.

It is a nialpdrome in base 13.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28541) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1285 + ... + 1306.

It is an arithmetic number, because the mean of its divisors is an integer number (7776).

2²⁸⁵⁰¹ is an apocalyptic number.

28501 is the 76-th centered decagonal number.

It is an amenable number.

28501 is a deficient number, since it is larger than the sum of its proper divisors (2603).

28501 is a wasteful number, since it uses less digits than its factorization.

28501 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2602.

The product of its (nonzero) digits is 80, while the sum is 16.

The square root of 28501 is about 168.8223918798. The cubic root of 28501 is about 30.5459309754.

It can be divided in two parts, 28 and 501, that multiplied together give a triangular number (14028 = T₁₆₇).

The spelling of 28501 in words is "twenty-eight thousand, five hundred one".