28857129 has 12 divisors (see below), whose sum is σ = 44758224. Its totient is φ = 16489704.

The previous prime is 28857121. The next prime is 28857131. The reversal of 28857129 is 92175882.

It is not a de Polignac number, because 28857129 - 2³ = 28857121 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28857121) 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, 98007 + ... + 98300.

It is an arithmetic number, because the mean of its divisors is an integer number (3729852).

Almost surely, 2^28857129 is an apocalyptic number.

It is an amenable number.

28857129 is a deficient number, since it is larger than the sum of its proper divisors (15901095).

28857129 is a wasteful number, since it uses less digits than its factorization.

28857129 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 196324 (or 196317 counting only the distinct ones).

The product of its digits is 80640, while the sum is 42.

The square root of 28857129 is about 5371.8831893480. The cubic root of 28857129 is about 306.7263172927.

The spelling of 28857129 in words is "twenty-eight million, eight hundred fifty-seven thousand, one hundred twenty-nine".