28950239 has 4 divisors (see below), whose sum is σ = 28963824. Its totient is φ = 28936656.

The previous prime is 28950227. The next prime is 28950263. The reversal of 28950239 is 93205982.

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

It is a cyclic number.

It is not a de Polignac number, because 28950239 - 2¹² = 28946143 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28950209) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2822 + ... + 8115.

It is an arithmetic number, because the mean of its divisors is an integer number (7240956).

Almost surely, 2^28950239 is an apocalyptic number.

28950239 is a deficient number, since it is larger than the sum of its proper divisors (13585).

28950239 is a wasteful number, since it uses less digits than its factorization.

28950239 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13584.

The product of its (nonzero) digits is 38880, while the sum is 38.

The square root of 28950239 is about 5380.5426306275. The cubic root of 28950239 is about 307.0558560353.

The spelling of 28950239 in words is "twenty-eight million, nine hundred fifty thousand, two hundred thirty-nine".