100720685 has 8 divisors (see below), whose sum is σ = 130162200. Its totient is φ = 74378304.

The previous prime is 100720667. The next prime is 100720693. The reversal of 100720685 is 586027001.

It can be written as a sum of positive squares in 4 ways, for example, as 2036329 + 98684356 = 1427^2 + 9934^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 100720685 - 2⁸ = 100720429 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 774710 + ... + 774839.

It is an arithmetic number, because the mean of its divisors is an integer number (16270275).

Almost surely, 2^100720685 is an apocalyptic number.

It is an amenable number.

100720685 is a deficient number, since it is larger than the sum of its proper divisors (29441515).

100720685 is a wasteful number, since it uses less digits than its factorization.

100720685 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1549567.

The product of its (nonzero) digits is 3360, while the sum is 29.

The square root of 100720685 is about 10035.9695595393. The cubic root of 100720685 is about 465.2712565395.

Adding to 100720685 its reverse (586027001), we get a palindrome (686747686).

The spelling of 100720685 in words is "one hundred million, seven hundred twenty thousand, six hundred eighty-five".