28308555 has 48 divisors (see below), whose sum is σ = 55349280. Its totient is φ = 13717440.

The previous prime is 28308551. The next prime is 28308557. The reversal of 28308555 is 55580382.

It is not a de Polignac number, because 28308555 - 2² = 28308551 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28308551) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 15469 + ... + 17201.

It is an arithmetic number, because the mean of its divisors is an integer number (1153110).

Almost surely, 2^28308555 is an apocalyptic number.

28308555 is a deficient number, since it is larger than the sum of its proper divisors (27040725).

28308555 is a wasteful number, since it uses less digits than its factorization.

28308555 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1769 (or 1752 counting only the distinct ones).

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

The square root of 28308555 is about 5320.5784459963. The cubic root of 28308555 is about 304.7702471113.

The spelling of 28308555 in words is "twenty-eight million, three hundred eight thousand, five hundred fifty-five".