105728505 has 8 divisors (see below), whose sum is σ = 169165632. Its totient is φ = 56388528.

The previous prime is 105728477. The next prime is 105728509. The reversal of 105728505 is 505827501.

It is a happy number.

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

It is not a de Polignac number, because 105728505 - 2⁵ = 105728473 is a prime.

It is a super-2 number, since 2×105728505² = 22357033539070050, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (105728509) 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, 3524269 + ... + 3524298.

It is an arithmetic number, because the mean of its divisors is an integer number (21145704).

Almost surely, 2^105728505 is an apocalyptic number.

105728505 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

105728505 is a deficient number, since it is larger than the sum of its proper divisors (63437127).

105728505 is an equidigital number, since it uses as much as digits as its factorization.

105728505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7048575.

The product of its (nonzero) digits is 14000, while the sum is 33.

The square root of 105728505 is about 10282.4367248235. The cubic root of 105728505 is about 472.8579522114.

The spelling of 105728505 in words is "one hundred five million, seven hundred twenty-eight thousand, five hundred five".