28623439 has 8 divisors (see below), whose sum is σ = 31144400. Its totient is φ = 26148096.

The previous prime is 28623421. The next prime is 28623449. The reversal of 28623439 is 93432682.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 28623439 - 2¹⁷ = 28492367 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 28623398 and 28623407.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28623449) 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 7 ways as a sum of consecutive naturals, for example, 10089 + ... + 12610.

It is an arithmetic number, because the mean of its divisors is an integer number (3893050).

Almost surely, 2^28623439 is an apocalyptic number.

28623439 is a deficient number, since it is larger than the sum of its proper divisors (2520961).

28623439 is a wasteful number, since it uses less digits than its factorization.

28623439 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22809.

The product of its digits is 62208, while the sum is 37.

The square root of 28623439 is about 5350.0877562896. The cubic root of 28623439 is about 305.8960979777.

The spelling of 28623439 in words is "twenty-eight million, six hundred twenty-three thousand, four hundred thirty-nine".