28315723 has 4 divisors (see below), whose sum is σ = 28714608. Its totient is φ = 27916840.

The previous prime is 28315717. The next prime is 28315739. The reversal of 28315723 is 32751382.

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 28315723 - 2⁹ = 28315211 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28315423) 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, 199336 + ... + 199477.

It is an arithmetic number, because the mean of its divisors is an integer number (7178652).

Almost surely, 2^28315723 is an apocalyptic number.

28315723 is a deficient number, since it is larger than the sum of its proper divisors (398885).

28315723 is an equidigital number, since it uses as much as digits as its factorization.

28315723 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 398884.

The product of its digits is 10080, while the sum is 31.

The square root of 28315723 is about 5321.2520143290. The cubic root of 28315723 is about 304.7959685321.

The spelling of 28315723 in words is "twenty-eight million, three hundred fifteen thousand, seven hundred twenty-three".