28621508 has 12 divisors (see below), whose sum is σ = 50178492. Its totient is φ = 14284800.

The previous prime is 28621507. The next prime is 28621511. The reversal of 28621508 is 80512682.

It can be written as a sum of positive squares in 2 ways, for example, as 22108804 + 6512704 = 4702^2 + 2552^2 .

It is not an unprimeable number, because it can be changed into a prime (28621507) 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 3 ways as a sum of consecutive naturals, for example, 3893 + ... + 8508.

It is an arithmetic number, because the mean of its divisors is an integer number (4181541).

Almost surely, 2^28621508 is an apocalyptic number.

It is an amenable number.

28621508 is a deficient number, since it is larger than the sum of its proper divisors (21556984).

28621508 is a wasteful number, since it uses less digits than its factorization.

28621508 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12982 (or 12980 counting only the distinct ones).

The product of its (nonzero) digits is 7680, while the sum is 32.

The square root of 28621508 is about 5349.9072889163. The cubic root of 28621508 is about 305.8892190157.

The spelling of 28621508 in words is "twenty-eight million, six hundred twenty-one thousand, five hundred eight".