28672439 has 4 divisors (see below), whose sum is σ = 28855224. Its totient is φ = 28489656.

The previous prime is 28672411. The next prime is 28672451. The reversal of 28672439 is 93427682.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28672439 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 28672396 and 28672405.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28672499) 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, 91157 + ... + 91470.

It is an arithmetic number, because the mean of its divisors is an integer number (7213806).

Almost surely, 2^28672439 is an apocalyptic number.

28672439 is a deficient number, since it is larger than the sum of its proper divisors (182785).

28672439 is a wasteful number, since it uses less digits than its factorization.

28672439 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 182784.

The product of its digits is 145152, while the sum is 41.

The square root of 28672439 is about 5354.6651622674. The cubic root of 28672439 is about 306.0705513204.

The spelling of 28672439 in words is "twenty-eight million, six hundred seventy-two thousand, four hundred thirty-nine".