28918045 has 8 divisors (see below), whose sum is σ = 37371096. Its totient is φ = 21354816.

The previous prime is 28918039. The next prime is 28918049. The reversal of 28918045 is 54081982.

It can be written as a sum of positive squares in 4 ways, for example, as 7043716 + 21874329 = 2654^2 + 4677^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 28918045 - 2⁹ = 28917533 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 28917995 and 28918013.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28918049) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 222382 + ... + 222511.

It is an arithmetic number, because the mean of its divisors is an integer number (4671387).

Almost surely, 2^28918045 is an apocalyptic number.

It is an amenable number.

28918045 is a deficient number, since it is larger than the sum of its proper divisors (8453051).

28918045 is a wasteful number, since it uses less digits than its factorization.

28918045 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 444911.

The product of its (nonzero) digits is 23040, while the sum is 37.

The square root of 28918045 is about 5377.5500927467. The cubic root of 28918045 is about 306.9419937304.

The spelling of 28918045 in words is "twenty-eight million, nine hundred eighteen thousand, forty-five".