28258645 has 4 divisors (see below), whose sum is σ = 33910380. Its totient is φ = 22606912.

The previous prime is 28258627. The next prime is 28258661. The reversal of 28258645 is 54685282.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 54685282 = 2 ⋅27342641.

It can be written as a sum of positive squares in 2 ways, for example, as 22221796 + 6036849 = 4714^2 + 2457^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28258645 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a junction number, because it is equal to n+sod(n) for n = 28258598 and 28258607.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2825860 + ... + 2825869.

It is an arithmetic number, because the mean of its divisors is an integer number (8477595).

Almost surely, 2^28258645 is an apocalyptic number.

It is an amenable number.

28258645 is a deficient number, since it is larger than the sum of its proper divisors (5651735).

28258645 is an equidigital number, since it uses as much as digits as its factorization.

28258645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5651734.

The product of its digits is 153600, while the sum is 40.

The square root of 28258645 is about 5315.8860973501. The cubic root of 28258645 is about 304.5910311910.

The spelling of 28258645 in words is "twenty-eight million, two hundred fifty-eight thousand, six hundred forty-five".