28438903 has 8 divisors (see below), whose sum is σ = 29302560. Its totient is φ = 27580320.

The previous prime is 28438897. The next prime is 28438987. The reversal of 28438903 is 30983482.

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

It is a cyclic number.

It is not a de Polignac number, because 28438903 - 2¹⁷ = 28307831 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (37).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28438103) 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, 12213 + ... + 14353.

It is an arithmetic number, because the mean of its divisors is an integer number (3662820).

Almost surely, 2^28438903 is an apocalyptic number.

28438903 is a deficient number, since it is larger than the sum of its proper divisors (863657).

28438903 is a wasteful number, since it uses less digits than its factorization.

28438903 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2537.

The product of its (nonzero) digits is 41472, while the sum is 37.

The square root of 28438903 is about 5332.8137976119. The cubic root of 28438903 is about 305.2373070277.

The spelling of 28438903 in words is "twenty-eight million, four hundred thirty-eight thousand, nine hundred three".