28556705 has 8 divisors (see below), whose sum is σ = 35104104. Its totient is φ = 22288000.

The previous prime is 28556701. The next prime is 28556707. The reversal of 28556705 is 50765582.

28556705 = T₄₂₂ + T₄₂₃ + ... + T₆₂₆.

It can be written as a sum of positive squares in 4 ways, for example, as 2505889 + 26050816 = 1583^2 + 5104^2 .

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

It is not a de Polignac number, because 28556705 - 2² = 28556701 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28556701) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 69446 + ... + 69855.

It is an arithmetic number, because the mean of its divisors is an integer number (4388013).

Almost surely, 2^28556705 is an apocalyptic number.

It is an amenable number.

28556705 is a deficient number, since it is larger than the sum of its proper divisors (6547399).

28556705 is a wasteful number, since it uses less digits than its factorization.

28556705 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 139347.

The product of its (nonzero) digits is 84000, while the sum is 38.

The square root of 28556705 is about 5343.8473967732. The cubic root of 28556705 is about 305.6581862528.

The spelling of 28556705 in words is "twenty-eight million, five hundred fifty-six thousand, seven hundred five".