28523071 has 4 divisors (see below), whose sum is σ = 28913872. Its totient is φ = 28132272.

The previous prime is 28522993. The next prime is 28523081. The reversal of 28523071 is 17032582.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 28523071 - 2⁷ = 28522943 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28523081) 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, 195291 + ... + 195436.

It is an arithmetic number, because the mean of its divisors is an integer number (7228468).

Almost surely, 2^28523071 is an apocalyptic number.

28523071 is a deficient number, since it is larger than the sum of its proper divisors (390801).

28523071 is an equidigital number, since it uses as much as digits as its factorization.

28523071 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 390800.

The product of its (nonzero) digits is 3360, while the sum is 28.

The square root of 28523071 is about 5340.6994860224. The cubic root of 28523071 is about 305.5381380167.

The spelling of 28523071 in words is "twenty-eight million, five hundred twenty-three thousand, seventy-one".