720106 has 4 divisors (see below), whose sum is σ = 1080162. Its totient is φ = 360052.

The previous prime is 720101. The next prime is 720127. The reversal of 720106 is 601027.

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

It can be written as a sum of positive squares in only one way, i.e., 525625 + 194481 = 725^2 + 441^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 720106.

It is not an unprimeable number, because it can be changed into a prime (720101) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 180025 + ... + 180028.

2⁷²⁰¹⁰⁶ is an apocalyptic number.

720106 is a deficient number, since it is larger than the sum of its proper divisors (360056).

720106 is a wasteful number, since it uses less digits than its factorization.

720106 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 360055.

The product of its (nonzero) digits is 84, while the sum is 16.

The square root of 720106 is about 848.5905962241. The cubic root of 720106 is about 89.6324931311.

The spelling of 720106 in words is "seven hundred twenty thousand, one hundred six".