106728145 has 4 divisors (see below), whose sum is σ = 128073780. Its totient is φ = 85382512.

The previous prime is 106728143. The next prime is 106728157. The reversal of 106728145 is 541827601.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 18386944 + 88341201 = 4288^2 + 9399^2 .

It is a cyclic number.

It is not a de Polignac number, because 106728145 - 2¹ = 106728143 is a prime.

It is a super-2 number, since 2×106728145² = 22781793870282050, 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 106728145.

It is not an unprimeable number, because it can be changed into a prime (106728143) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 10672810 + ... + 10672819.

It is an arithmetic number, because the mean of its divisors is an integer number (32018445).

Almost surely, 2^106728145 is an apocalyptic number.

It is an amenable number.

106728145 is a deficient number, since it is larger than the sum of its proper divisors (21345635).

106728145 is an equidigital number, since it uses as much as digits as its factorization.

106728145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21345634.

The product of its (nonzero) digits is 13440, while the sum is 34.

The square root of 106728145 is about 10330.9314681688. The cubic root of 106728145 is about 474.3435363797.

The spelling of 106728145 in words is "one hundred six million, seven hundred twenty-eight thousand, one hundred forty-five".