100720005 has 16 divisors (see below), whose sum is σ = 162385344. Its totient is φ = 53306240.

The previous prime is 100719991. The next prime is 100720027. The reversal of 100720005 is 500027001.

It is a happy number.

It is not a de Polignac number, because 100720005 - 2⁴ = 100719989 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 23664 + ... + 27593.

It is an arithmetic number, because the mean of its divisors is an integer number (10149084).

Almost surely, 2^100720005 is an apocalyptic number.

100720005 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

100720005 is a deficient number, since it is larger than the sum of its proper divisors (61665339).

100720005 is a wasteful number, since it uses less digits than its factorization.

100720005 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51396.

The product of its (nonzero) digits is 70, while the sum is 15.

The square root of 100720005 is about 10035.9356813403. The cubic root of 100720005 is about 465.2702094684.

Adding to 100720005 its reverse (500027001), we get a palindrome (600747006).

It can be divided in two parts, 1007 and 20005, that added together give a palindrome (21012).

The spelling of 100720005 in words is "one hundred million, seven hundred twenty thousand, five".