28308553 has 32 divisors (see below), whose sum is σ = 38223360. Its totient is φ = 20321280.

The previous prime is 28308551. The next prime is 28308557. The reversal of 28308553 is 35580382.

It is not a de Polignac number, because 28308553 - 2¹ = 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 31 ways as a sum of consecutive naturals, for example, 44548 + ... + 45178.

It is an arithmetic number, because the mean of its divisors is an integer number (1194480).

Almost surely, 2^28308553 is an apocalyptic number.

It is an amenable number.

28308553 is a deficient number, since it is larger than the sum of its proper divisors (9914807).

28308553 is a wasteful number, since it uses less digits than its factorization.

28308553 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 697.

The product of its (nonzero) digits is 28800, while the sum is 34.

The square root of 28308553 is about 5320.5782580468. The cubic root of 28308553 is about 304.7702399339.

The spelling of 28308553 in words is "twenty-eight million, three hundred eight thousand, five hundred fifty-three".