28785057 has 24 divisors (see below), whose sum is σ = 46305216. Its totient is φ = 15578784.

The previous prime is 28785013. The next prime is 28785073. The reversal of 28785057 is 75058782.

It is a happy number.

It is not a de Polignac number, because 28785057 - 2⁸ = 28784801 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28785007) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 5683 + ... + 9479.

It is an arithmetic number, because the mean of its divisors is an integer number (1929384).

Almost surely, 2^28785057 is an apocalyptic number.

It is an amenable number.

28785057 is a deficient number, since it is larger than the sum of its proper divisors (17520159).

28785057 is a wasteful number, since it uses less digits than its factorization.

28785057 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3845 (or 3826 counting only the distinct ones).

The product of its (nonzero) digits is 156800, while the sum is 42.

The square root of 28785057 is about 5365.1707335368. The cubic root of 28785057 is about 306.4707500737.

The spelling of 28785057 in words is "twenty-eight million, seven hundred eighty-five thousand, fifty-seven".