28508836 has 24 divisors (see below), whose sum is σ = 51188760. Its totient is φ = 13888512.

The previous prime is 28508819. The next prime is 28508839. The reversal of 28508836 is 63880582.

It can be written as a sum of positive squares in 4 ways, for example, as 630436 + 27878400 = 794^2 + 5280^2 .

It is a super-3 number, since 3×28508836³ (a number of 23 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (28508839) 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, 25440 + ... + 26536.

It is an arithmetic number, because the mean of its divisors is an integer number (2132865).

Almost surely, 2^28508836 is an apocalyptic number.

It is an amenable number.

28508836 is a deficient number, since it is larger than the sum of its proper divisors (22679924).

28508836 is a wasteful number, since it uses less digits than its factorization.

28508836 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1263 (or 1261 counting only the distinct ones).

The product of its (nonzero) digits is 92160, while the sum is 40.

The square root of 28508836 is about 5339.3666291050. The cubic root of 28508836 is about 305.4873012848.

The spelling of 28508836 in words is "twenty-eight million, five hundred eight thousand, eight hundred thirty-six".