28988438 has 8 divisors (see below), whose sum is σ = 43506120. Its totient is φ = 14486400.

The previous prime is 28988437. The next prime is 28988447. The reversal of 28988438 is 83488982.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28988431) 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, 3638 + ... + 8438.

It is an arithmetic number, because the mean of its divisors is an integer number (5438265).

Almost surely, 2^28988438 is an apocalyptic number.

28988438 is a deficient number, since it is larger than the sum of its proper divisors (14517682).

28988438 is a wasteful number, since it uses less digits than its factorization.

28988438 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7822.

The product of its digits is 884736, while the sum is 50.

The square root of 28988438 is about 5384.0911953644. The cubic root of 28988438 is about 307.1908471100.

The spelling of 28988438 in words is "twenty-eight million, nine hundred eighty-eight thousand, four hundred thirty-eight".