28238819 has 8 divisors (see below), whose sum is σ = 34171488. Its totient is φ = 22780800.

The previous prime is 28238801. The next prime is 28238839. The reversal of 28238819 is 91883282.

It is a happy number.

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

It is not a de Polignac number, because 28238819 - 2⁸ = 28238563 is a prime.

It is a super-2 number, since 2×28238819² = 1594861797029522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28238839) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 118532 + ... + 118769.

It is an arithmetic number, because the mean of its divisors is an integer number (4271436).

Almost surely, 2^28238819 is an apocalyptic number.

28238819 is a deficient number, since it is larger than the sum of its proper divisors (5932669).

28238819 is a wasteful number, since it uses less digits than its factorization.

28238819 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 237325.

The product of its digits is 55296, while the sum is 41.

The square root of 28238819 is about 5314.0209822695. The cubic root of 28238819 is about 304.5197817899.

The spelling of 28238819 in words is "twenty-eight million, two hundred thirty-eight thousand, eight hundred nineteen".