28757071 has 12 divisors (see below), whose sum is σ = 33583032. Its totient is φ = 24552528.

The previous prime is 28757063. The next prime is 28757077. The reversal of 28757071 is 17075782.

It is not a de Polignac number, because 28757071 - 2³ = 28757063 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 28757071.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28757077) 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, 13356 + ... + 15358.

It is an arithmetic number, because the mean of its divisors is an integer number (2798586).

Almost surely, 2^28757071 is an apocalyptic number.

28757071 is a deficient number, since it is larger than the sum of its proper divisors (4825961).

28757071 is a wasteful number, since it uses less digits than its factorization.

28757071 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2310 (or 2303 counting only the distinct ones).

The product of its (nonzero) digits is 27440, while the sum is 37.

The square root of 28757071 is about 5362.5619809938. The cubic root of 28757071 is about 306.3713967702.

The spelling of 28757071 in words is "twenty-eight million, seven hundred fifty-seven thousand, seventy-one".