30105605 has 16 divisors (see below), whose sum is σ = 37288944. Its totient is φ = 23316480.

The previous prime is 30105601. The next prime is 30105631. The reversal of 30105605 is 50650103.

It can be written as a sum of positive squares in 8 ways, for example, as 9409 + 30096196 = 97^2 + 5486^2 .

It is not a de Polignac number, because 30105605 - 2² = 30105601 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (30105601) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 65075 + ... + 65535.

It is an arithmetic number, because the mean of its divisors is an integer number (2330559).

Almost surely, 2^30105605 is an apocalyptic number.

It is an amenable number.

30105605 is a deficient number, since it is larger than the sum of its proper divisors (7183339).

30105605 is a wasteful number, since it uses less digits than its factorization.

30105605 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 856.

The product of its (nonzero) digits is 450, while the sum is 20.

The square root of 30105605 is about 5486.8574794686. The cubic root of 30105605 is about 311.0874228232.

Adding to 30105605 its reverse (50650103), we get a palindrome (80755708).

The spelling of 30105605 in words is "thirty million, one hundred five thousand, six hundred five".