28517951 has 24 divisors (see below), whose sum is σ = 36528336. Its totient is φ = 22014720.

The previous prime is 28517939. The next prime is 28517969. The reversal of 28517951 is 15971582.

It is not a de Polignac number, because 28517951 - 2¹⁴ = 28501567 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28517911) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 84455 + ... + 84791.

It is an arithmetic number, because the mean of its divisors is an integer number (1522014).

Almost surely, 2^28517951 is an apocalyptic number.

28517951 is a deficient number, since it is larger than the sum of its proper divisors (8010385).

28517951 is a wasteful number, since it uses less digits than its factorization.

28517951 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 519 (or 512 counting only the distinct ones).

The product of its digits is 25200, while the sum is 38.

The square root of 28517951 is about 5340.2201265491. The cubic root of 28517951 is about 305.5198551691.

The spelling of 28517951 in words is "twenty-eight million, five hundred seventeen thousand, nine hundred fifty-one".