28557135 has 12 divisors (see below), whose sum is σ = 49499112. Its totient is φ = 15230448.

The previous prime is 28557119. The next prime is 28557143. The reversal of 28557135 is 53175582.

28557135 is a `hidden beast` number, since 2 + 85 + 571 + 3 + 5 = 666.

It is not a de Polignac number, because 28557135 - 2⁴ = 28557119 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 28557135.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 317257 + ... + 317346.

It is an arithmetic number, because the mean of its divisors is an integer number (4124926).

Almost surely, 2^28557135 is an apocalyptic number.

28557135 is a deficient number, since it is larger than the sum of its proper divisors (20941977).

28557135 is a wasteful number, since it uses less digits than its factorization.

28557135 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 634614 (or 634611 counting only the distinct ones).

The product of its digits is 42000, while the sum is 36.

The square root of 28557135 is about 5343.8876298066. The cubic root of 28557135 is about 305.6597204209.

The spelling of 28557135 in words is "twenty-eight million, five hundred fifty-seven thousand, one hundred thirty-five".