28855705 has 8 divisors (see below), whose sum is σ = 34876800. Its totient is φ = 22917936.

The previous prime is 28855663. The next prime is 28855741. The reversal of 28855705 is 50755882.

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 28855705 - 2⁷ = 28855577 is a prime.

It is a super-2 number, since 2×28855705² = 1665303422094050, which contains 22 as substring.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 20065 + ... + 21454.

It is an arithmetic number, because the mean of its divisors is an integer number (4359600).

Almost surely, 2^28855705 is an apocalyptic number.

It is an amenable number.

28855705 is a deficient number, since it is larger than the sum of its proper divisors (6021095).

28855705 is a wasteful number, since it uses less digits than its factorization.

28855705 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41663.

The product of its (nonzero) digits is 112000, while the sum is 40.

The square root of 28855705 is about 5371.7506457392. The cubic root of 28855705 is about 306.7212719136.

The spelling of 28855705 in words is "twenty-eight million, eight hundred fifty-five thousand, seven hundred five".