28423253 has 4 divisors (see below), whose sum is σ = 28630860. Its totient is φ = 28215648.

The previous prime is 28423243. The next prime is 28423261. The reversal of 28423253 is 35232482.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 35232482 = 2 ⋅17616241.

It can be written as a sum of positive squares in 2 ways, for example, as 18645124 + 9778129 = 4318^2 + 3127^2 .

It is a cyclic number.

It is not a de Polignac number, because 28423253 - 2⁶ = 28423189 is a prime.

It is a super-2 number, since 2×28423253² = 1615762622204018, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28423243) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 103598 + ... + 103871.

It is an arithmetic number, because the mean of its divisors is an integer number (7157715).

Almost surely, 2^28423253 is an apocalyptic number.

It is an amenable number.

28423253 is a deficient number, since it is larger than the sum of its proper divisors (207607).

28423253 is a wasteful number, since it uses less digits than its factorization.

28423253 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 207606.

The product of its digits is 11520, while the sum is 29.

The square root of 28423253 is about 5331.3462652505. The cubic root of 28423253 is about 305.1813058008.

The spelling of 28423253 in words is "twenty-eight million, four hundred twenty-three thousand, two hundred fifty-three".