28257055 has 8 divisors (see below), whose sum is σ = 34290000. Its totient is φ = 22351296.

The previous prime is 28257037. The next prime is 28257067. The reversal of 28257055 is 55075282.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 28257055 - 2⁷ = 28256927 is a prime.

It is a super-2 number, since 2×28257055² = 1596922314546050, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 28257055.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 31305 + ... + 32194.

It is an arithmetic number, because the mean of its divisors is an integer number (4286250).

Almost surely, 2^28257055 is an apocalyptic number.

28257055 is a deficient number, since it is larger than the sum of its proper divisors (6032945).

28257055 is an equidigital number, since it uses as much as digits as its factorization.

28257055 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 63593.

The product of its (nonzero) digits is 28000, while the sum is 34.

The square root of 28257055 is about 5315.7365435093. The cubic root of 28257055 is about 304.5853183808.

The spelling of 28257055 in words is "twenty-eight million, two hundred fifty-seven thousand, fifty-five".