28357023 has 4 divisors (see below), whose sum is σ = 37809368. Its totient is φ = 18904680.

The previous prime is 28357019. The next prime is 28357057. The reversal of 28357023 is 32075382.

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

It is not a de Polignac number, because 28357023 - 2² = 28357019 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 (28357073) 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, 4726168 + ... + 4726173.

It is an arithmetic number, because the mean of its divisors is an integer number (9452342).

Almost surely, 2^28357023 is an apocalyptic number.

28357023 is a deficient number, since it is larger than the sum of its proper divisors (9452345).

28357023 is an equidigital number, since it uses as much as digits as its factorization.

28357023 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9452344.

The product of its (nonzero) digits is 10080, while the sum is 30.

The square root of 28357023 is about 5325.1312659877. The cubic root of 28357023 is about 304.9440836309.

The spelling of 28357023 in words is "twenty-eight million, three hundred fifty-seven thousand, twenty-three".