28501313 has 4 divisors (see below), whose sum is σ = 28536768. Its totient is φ = 28465860.

The previous prime is 28501241. The next prime is 28501327. The reversal of 28501313 is 31310582.

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, and also an emirpimes, since its reverse is a distinct semiprime: 31310582 = 2 ⋅15655291.

It is a cyclic number.

It is not a de Polignac number, because 28501313 - 2²² = 24307009 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28501373) 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, 16493 + ... + 18138.

It is an arithmetic number, because the mean of its divisors is an integer number (7134192).

Almost surely, 2^28501313 is an apocalyptic number.

It is an amenable number.

28501313 is a deficient number, since it is larger than the sum of its proper divisors (35455).

28501313 is an equidigital number, since it uses as much as digits as its factorization.

28501313 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35454.

The product of its (nonzero) digits is 720, while the sum is 23.

The square root of 28501313 is about 5338.6620983164. The cubic root of 28501313 is about 305.4604279422.

Adding to 28501313 its reverse (31310582), we get a palindrome (59811895).

The spelling of 28501313 in words is "twenty-eight million, five hundred one thousand, three hundred thirteen".