28030545 has 12 divisors (see below), whose sum is σ = 48586356. Its totient is φ = 14949600.

The previous prime is 28030531. The next prime is 28030547. The reversal of 28030545 is 54503082.

It can be written as a sum of positive squares in 2 ways, for example, as 9290304 + 18740241 = 3048^2 + 4329^2 .

It is not a de Polignac number, because 28030545 - 2⁹ = 28030033 is a prime.

It is a super-2 number, since 2×28030545² = 1571422905994050, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (28030547) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 311406 + ... + 311495.

It is an arithmetic number, because the mean of its divisors is an integer number (4048863).

Almost surely, 2^28030545 is an apocalyptic number.

It is an amenable number.

28030545 is a deficient number, since it is larger than the sum of its proper divisors (20555811).

28030545 is a wasteful number, since it uses less digits than its factorization.

28030545 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 622912 (or 622909 counting only the distinct ones).

The product of its (nonzero) digits is 4800, while the sum is 27.

The square root of 28030545 is about 5294.3880666230. The cubic root of 28030545 is about 303.7692768338.

The spelling of 28030545 in words is "twenty-eight million, thirty thousand, five hundred forty-five".