28658457 has 6 divisors (see below), whose sum is σ = 41395562. Its totient is φ = 19105632.

The previous prime is 28658431. The next prime is 28658459. The reversal of 28658457 is 75485682.

It can be written as a sum of positive squares in only one way, i.e., 28611801 + 46656 = 5349^2 + 216^2 .

It is not a de Polignac number, because 28658457 - 2¹¹ = 28656409 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28658459) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1592128 + ... + 1592145.

Almost surely, 2^28658457 is an apocalyptic number.

It is an amenable number.

28658457 is a deficient number, since it is larger than the sum of its proper divisors (12737105).

28658457 is a wasteful number, since it uses less digits than its factorization.

28658457 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3184279 (or 3184276 counting only the distinct ones).

The product of its digits is 537600, while the sum is 45.

The square root of 28658457 is about 5353.3594125558. The cubic root of 28658457 is about 306.0207918719.

The spelling of 28658457 in words is "twenty-eight million, six hundred fifty-eight thousand, four hundred fifty-seven".