28745523 has 10 divisors (see below), whose sum is σ = 42940964. Its totient is φ = 19163628.

The previous prime is 28745513. The next prime is 28745531. The reversal of 28745523 is 32554782.

It is not a de Polignac number, because 28745523 - 2⁵ = 28745491 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28745503) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 177361 + ... + 177522.

Almost surely, 2^28745523 is an apocalyptic number.

28745523 is a deficient number, since it is larger than the sum of its proper divisors (14195441).

28745523 is an equidigital number, since it uses as much as digits as its factorization.

28745523 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 354895 (or 354886 counting only the distinct ones).

The product of its digits is 67200, while the sum is 36.

The square root of 28745523 is about 5361.4851487251. The cubic root of 28745523 is about 306.3303813439.

The spelling of 28745523 in words is "twenty-eight million, seven hundred forty-five thousand, five hundred twenty-three".