28355508 has 30 divisors (see below), whose sum is σ = 74127746. Its totient is φ = 9451728.

The previous prime is 28355501. The next prime is 28355513. The reversal of 28355508 is 80555382.

It can be written as a sum of positive squares in only one way, i.e., 17740944 + 10614564 = 4212^2 + 3258^2 .

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28355501) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 43435 + ... + 44082.

Almost surely, 2^28355508 is an apocalyptic number.

It is an amenable number.

28355508 is an abundant number, since it is smaller than the sum of its proper divisors (45772238).

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

28355508 is a wasteful number, since it uses less digits than its factorization.

28355508 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 87533 (or 87522 counting only the distinct ones).

The product of its (nonzero) digits is 48000, while the sum is 36.

The square root of 28355508 is about 5324.9890140732. The cubic root of 28355508 is about 304.9386528950.

The spelling of 28355508 in words is "twenty-eight million, three hundred fifty-five thousand, five hundred eight".