100640305 has 4 divisors (see below), whose sum is σ = 120768372. Its totient is φ = 80512240.

The previous prime is 100640303. The next prime is 100640329. The reversal of 100640305 is 503046001.

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 40360609 + 60279696 = 6353^2 + 7764^2 .

It is not a de Polignac number, because 100640305 - 2¹ = 100640303 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (100640303) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10064026 + ... + 10064035.

It is an arithmetic number, because the mean of its divisors is an integer number (30192093).

Almost surely, 2^100640305 is an apocalyptic number.

It is an amenable number.

100640305 is a deficient number, since it is larger than the sum of its proper divisors (20128067).

100640305 is an equidigital number, since it uses as much as digits as its factorization.

100640305 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20128066.

The product of its (nonzero) digits is 360, while the sum is 19.

The square root of 100640305 is about 10031.9641646090. The cubic root of 100640305 is about 465.1474539111.

Adding to 100640305 its reverse (503046001), we get a palindrome (603686306).

The spelling of 100640305 in words is "one hundred million, six hundred forty thousand, three hundred five".