28438798 has 4 divisors (see below), whose sum is σ = 42658200. Its totient is φ = 14219398.

The previous prime is 28438783. The next prime is 28438799. The reversal of 28438798 is 89783482.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 89783482 = 2 ⋅44891741.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28438799) 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 as a sum of consecutive naturals, namely, 7109698 + ... + 7109701.

It is an arithmetic number, because the mean of its divisors is an integer number (10664550).

Almost surely, 2^28438798 is an apocalyptic number.

28438798 is a deficient number, since it is larger than the sum of its proper divisors (14219402).

28438798 is a wasteful number, since it uses less digits than its factorization.

28438798 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14219401.

The product of its digits is 774144, while the sum is 49.

The square root of 28438798 is about 5332.8039528938. The cubic root of 28438798 is about 305.2369313691.

The spelling of 28438798 in words is "twenty-eight million, four hundred thirty-eight thousand, seven hundred ninety-eight".