28897557 has 16 divisors (see below), whose sum is σ = 41596800. Its totient is φ = 17739072.

The previous prime is 28897511. The next prime is 28897571. The reversal of 28897557 is 75579882.

It is not a de Polignac number, because 28897557 - 2¹² = 28893461 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28897357) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 22743 + ... + 23979.

It is an arithmetic number, because the mean of its divisors is an integer number (2599800).

Almost surely, 2^28897557 is an apocalyptic number.

It is an amenable number.

28897557 is a deficient number, since it is larger than the sum of its proper divisors (12699243).

28897557 is a wasteful number, since it uses less digits than its factorization.

28897557 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1852.

The product of its digits is 1411200, while the sum is 51.

The square root of 28897557 is about 5375.6447985335. The cubic root of 28897557 is about 306.8694886759.

The spelling of 28897557 in words is "twenty-eight million, eight hundred ninety-seven thousand, five hundred fifty-seven".