28423969 has 6 divisors (see below), whose sum is σ = 33064674. Its totient is φ = 24363360.

The previous prime is 28423961. The next prime is 28423979. The reversal of 28423969 is 96932482.

It can be written as a sum of positive squares in only one way, i.e., 22924944 + 5499025 = 4788^2 + 2345^2 .

It is not a de Polignac number, because 28423969 - 2³ = 28423961 is a prime.

It is a super-2 number, since 2×28423969² = 1615844027425922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28423961) 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 5 ways as a sum of consecutive naturals, for example, 289992 + ... + 290089.

It is an arithmetic number, because the mean of its divisors is an integer number (5510779).

Almost surely, 2^28423969 is an apocalyptic number.

It is an amenable number.

28423969 is a deficient number, since it is larger than the sum of its proper divisors (4640705).

28423969 is an equidigital number, since it uses as much as digits as its factorization.

28423969 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 580095 (or 580088 counting only the distinct ones).

The product of its digits is 186624, while the sum is 43.

The square root of 28423969 is about 5331.4134148460. The cubic root of 28423969 is about 305.1838683503.

It can be divided in two parts, 28423 and 969, that added together give a palindrome (29392).

The spelling of 28423969 in words is "twenty-eight million, four hundred twenty-three thousand, nine hundred sixty-nine".