28517949 has 12 divisors (see below), whose sum is σ = 41267200. Its totient is φ = 18977544.

The previous prime is 28517939. The next prime is 28517969. The reversal of 28517949 is 94971582.

It is not a de Polignac number, because 28517949 - 2⁷ = 28517821 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28517939) 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, 3012 + ... + 8130.

Almost surely, 2^28517949 is an apocalyptic number.

It is an amenable number.

28517949 is a deficient number, since it is larger than the sum of its proper divisors (12749251).

28517949 is a wasteful number, since it uses less digits than its factorization.

28517949 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5744 (or 5741 counting only the distinct ones).

The product of its digits is 181440, while the sum is 45.

The square root of 28517949 is about 5340.2199392909. The cubic root of 28517949 is about 305.5198480269.

The spelling of 28517949 in words is "twenty-eight million, five hundred seventeen thousand, nine hundred forty-nine".