28759257 has 18 divisors (see below), whose sum is σ = 44132478. Its totient is φ = 18043392.

The previous prime is 28759219. The next prime is 28759273. The reversal of 28759257 is 75295782.

It is a happy number.

28759257 is a `hidden beast` number, since 2 + 8 + 7 + 592 + 57 = 666.

It can be written as a sum of positive squares in 3 ways, for example, as 7080921 + 21678336 = 2661^2 + 4656^2 .

It is not a de Polignac number, because 28759257 - 2¹⁴ = 28742873 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28759207) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 2928 + ... + 8129.

Almost surely, 2^28759257 is an apocalyptic number.

It is an amenable number.

28759257 is a deficient number, since it is larger than the sum of its proper divisors (15373221).

28759257 is a wasteful number, since it uses less digits than its factorization.

28759257 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11097 (or 11077 counting only the distinct ones).

The product of its digits is 352800, while the sum is 45.

The square root of 28759257 is about 5362.7657976085. The cubic root of 28759257 is about 306.3791596251.

The spelling of 28759257 in words is "twenty-eight million, seven hundred fifty-nine thousand, two hundred fifty-seven".