28438530 has 32 divisors (see below), whose sum is σ = 68416704. Its totient is φ = 7565376.

The previous prime is 28438517. The next prime is 28438541. The reversal of 28438530 is 3583482.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 28438491 and 28438500.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 15544 + ... + 17276.

It is an arithmetic number, because the mean of its divisors is an integer number (2138022).

Almost surely, 2^28438530 is an apocalyptic number.

28438530 is an abundant number, since it is smaller than the sum of its proper divisors (39978174).

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

28438530 is a wasteful number, since it uses less digits than its factorization.

28438530 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2290.

The product of its (nonzero) digits is 23040, while the sum is 33.

The square root of 28438530 is about 5332.7788253405. The cubic root of 28438530 is about 305.2359725410.

The spelling of 28438530 in words is "twenty-eight million, four hundred thirty-eight thousand, five hundred thirty".