105728663 has 4 divisors (see below), whose sum is σ = 106017120. Its totient is φ = 105440208.

The previous prime is 105728657. The next prime is 105728669. The reversal of 105728663 is 366827501.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 366827501 = 137 ⋅2677573.

It is an interprime number because it is at equal distance from previous prime (105728657) and next prime (105728669).

It is a cyclic number.

It is not a de Polignac number, because 105728663 - 2⁶ = 105728599 is a prime.

It is a super-2 number, since 2×105728663² = 22357100359535138, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (105728669) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 143678 + ... + 144411.

It is an arithmetic number, because the mean of its divisors is an integer number (26504280).

Almost surely, 2^105728663 is an apocalyptic number.

105728663 is a deficient number, since it is larger than the sum of its proper divisors (288457).

105728663 is an equidigital number, since it uses as much as digits as its factorization.

105728663 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 288456.

The product of its (nonzero) digits is 60480, while the sum is 38.

The square root of 105728663 is about 10282.4444078244. Note that the first 4 decimals coincide. The cubic root of 105728663 is about 472.8581877565.

The spelling of 105728663 in words is "one hundred five million, seven hundred twenty-eight thousand, six hundred sixty-three".