28923438 has 16 divisors (see below), whose sum is σ = 58168656. Its totient is φ = 9587520.

The previous prime is 28923437. The next prime is 28923439. The reversal of 28923438 is 83432982.

It is an interprime number because it is at equal distance from previous prime (28923437) and next prime (28923439).

It is a junction number, because it is equal to n+sod(n) for n = 28923396 and 28923405.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28923437) 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, 12231 + ... + 14402.

It is an arithmetic number, because the mean of its divisors is an integer number (3635541).

Almost surely, 2^28923438 is an apocalyptic number.

28923438 is an abundant number, since it is smaller than the sum of its proper divisors (29245218).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

28923438 is a wasteful number, since it uses less digits than its factorization.

28923438 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26819.

The product of its digits is 82944, while the sum is 39.

The square root of 28923438 is about 5378.0515058895. The cubic root of 28923438 is about 306.9610733429.

The spelling of 28923438 in words is "twenty-eight million, nine hundred twenty-three thousand, four hundred thirty-eight".