100720807 has 4 divisors (see below), whose sum is σ = 109877256. Its totient is φ = 91564360.

The previous prime is 100720793. The next prime is 100720811. The reversal of 100720807 is 708027001.

It is a happy number.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-100720807 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 (100720877) 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, 4578208 + ... + 4578229.

It is an arithmetic number, because the mean of its divisors is an integer number (27469314).

Almost surely, 2^100720807 is an apocalyptic number.

100720807 is a deficient number, since it is larger than the sum of its proper divisors (9156449).

100720807 is an equidigital number, since it uses as much as digits as its factorization.

100720807 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9156448.

The product of its (nonzero) digits is 784, while the sum is 25.

The square root of 100720807 is about 10035.9756376747. The cubic root of 100720807 is about 465.2714443959.

Adding to 100720807 its reverse (708027001), we get a palindrome (808747808).

The spelling of 100720807 in words is "one hundred million, seven hundred twenty thousand, eight hundred seven".