28747257 has 16 divisors (see below), whose sum is σ = 47788032. Its totient is φ = 14933520.

The previous prime is 28747189. The next prime is 28747259. The reversal of 28747257 is 75274782.

It is not a de Polignac number, because 28747257 - 2⁷ = 28747129 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28747259) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 61993 + ... + 62454.

It is an arithmetic number, because the mean of its divisors is an integer number (2986752).

Almost surely, 2^28747257 is an apocalyptic number.

It is an amenable number.

28747257 is a deficient number, since it is larger than the sum of its proper divisors (19040775).

28747257 is a wasteful number, since it uses less digits than its factorization.

28747257 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 124468.

The product of its digits is 219520, while the sum is 42.

The square root of 28747257 is about 5361.6468552116. The cubic root of 28747257 is about 306.3365407518.

The spelling of 28747257 in words is "twenty-eight million, seven hundred forty-seven thousand, two hundred fifty-seven".