28520838 has 12 divisors (see below), whose sum is σ = 61795188. Its totient is φ = 9506940.

The previous prime is 28520827. The next prime is 28520839. The reversal of 28520838 is 83802582.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28520839) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 792228 + ... + 792263.

It is an arithmetic number, because the mean of its divisors is an integer number (5149599).

Almost surely, 2^28520838 is an apocalyptic number.

28520838 is an abundant number, since it is smaller than the sum of its proper divisors (33274350).

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

28520838 is a wasteful number, since it uses less digits than its factorization.

28520838 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1584499 (or 1584496 counting only the distinct ones).

The product of its (nonzero) digits is 30720, while the sum is 36.

The square root of 28520838 is about 5340.4904269177. The cubic root of 28520838 is about 305.5301645360.

The spelling of 28520838 in words is "twenty-eight million, five hundred twenty thousand, eight hundred thirty-eight".