28705356 has 36 divisors (see below), whose sum is σ = 72727200. Its totient is φ = 9546528.

The previous prime is 28705343. The next prime is 28705363. The reversal of 28705356 is 65350782.

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a self number, because there is not a number n which added to its sum of digits gives 28705356.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 25330 + ... + 26438.

It is an arithmetic number, because the mean of its divisors is an integer number (2020200).

Almost surely, 2^28705356 is an apocalyptic number.

It is an amenable number.

28705356 is an abundant number, since it is smaller than the sum of its proper divisors (44021844).

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

28705356 is a wasteful number, since it uses less digits than its factorization.

28705356 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1838 (or 1833 counting only the distinct ones).

The product of its (nonzero) digits is 50400, while the sum is 36.

The square root of 28705356 is about 5357.7379555182. The cubic root of 28705356 is about 306.1876332254.

The spelling of 28705356 in words is "twenty-eight million, seven hundred five thousand, three hundred fifty-six".