28427439 has 32 divisors (see below), whose sum is σ = 41472000. Its totient is φ = 17263584.

The previous prime is 28427419. The next prime is 28427447. The reversal of 28427439 is 93472482.

It is not a de Polignac number, because 28427439 - 2⁹ = 28426927 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 28427397 and 28427406.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28427419) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 265624 + ... + 265730.

It is an arithmetic number, because the mean of its divisors is an integer number (1296000).

Almost surely, 2^28427439 is an apocalyptic number.

28427439 is a deficient number, since it is larger than the sum of its proper divisors (13044561).

28427439 is a wasteful number, since it uses less digits than its factorization.

28427439 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 267.

The product of its digits is 96768, while the sum is 39.

The square root of 28427439 is about 5331.7388345642. The cubic root of 28427439 is about 305.1962868005.

The spelling of 28427439 in words is "twenty-eight million, four hundred twenty-seven thousand, four hundred thirty-nine".