28423427 has 4 divisors (see below), whose sum is σ = 28905240. Its totient is φ = 27941616.

The previous prime is 28423399. The next prime is 28423441. The reversal of 28423427 is 72432482.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 72432482 = 2 ⋅36216241.

It is a cyclic number.

It is not a de Polignac number, because 28423427 - 2¹⁰ = 28422403 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 28423393 and 28423402.

It is not an unprimeable number, because it can be changed into a prime (28423457) 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, 240818 + ... + 240935.

It is an arithmetic number, because the mean of its divisors is an integer number (7226310).

Almost surely, 2^28423427 is an apocalyptic number.

28423427 is a deficient number, since it is larger than the sum of its proper divisors (481813).

28423427 is an equidigital number, since it uses as much as digits as its factorization.

28423427 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 481812.

The product of its digits is 21504, while the sum is 32.

The square root of 28423427 is about 5331.3625838054. The cubic root of 28423427 is about 305.1819285472.

The spelling of 28423427 in words is "twenty-eight million, four hundred twenty-three thousand, four hundred twenty-seven".