28508756 has 12 divisors (see below), whose sum is σ = 49928340. Its totient is φ = 14243520.

The previous prime is 28508731. The next prime is 28508771. The reversal of 28508756 is 65780582.

It can be written as a sum of positive squares in 2 ways, for example, as 17724100 + 10784656 = 4210^2 + 3284^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7280 + ... + 10488.

It is an arithmetic number, because the mean of its divisors is an integer number (4160695).

Almost surely, 2^28508756 is an apocalyptic number.

It is an amenable number.

28508756 is a deficient number, since it is larger than the sum of its proper divisors (21419584).

28508756 is a wasteful number, since it uses less digits than its factorization.

28508756 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5434 (or 5432 counting only the distinct ones).

The product of its (nonzero) digits is 134400, while the sum is 41.

The square root of 28508756 is about 5339.3591375745. The cubic root of 28508756 is about 305.4870155371.

The spelling of 28508756 in words is "twenty-eight million, five hundred eight thousand, seven hundred fifty-six".