28394723 has 4 divisors (see below), whose sum is σ = 32451120. Its totient is φ = 24338328.

The previous prime is 28394701. The next prime is 28394761. The reversal of 28394723 is 32749382.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 32749382 = 2 ⋅16374691.

It is not a de Polignac number, because 28394723 - 2¹⁰ = 28393699 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28304723) 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, 2028188 + ... + 2028201.

It is an arithmetic number, because the mean of its divisors is an integer number (8112780).

Almost surely, 2^28394723 is an apocalyptic number.

28394723 is a deficient number, since it is larger than the sum of its proper divisors (4056397).

28394723 is an equidigital number, since it uses as much as digits as its factorization.

28394723 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4056396.

The product of its digits is 72576, while the sum is 38.

The square root of 28394723 is about 5328.6699090861. The cubic root of 28394723 is about 305.0791624670.

The spelling of 28394723 in words is "twenty-eight million, three hundred ninety-four thousand, seven hundred twenty-three".