720105 has 16 divisors (see below), whose sum is σ = 1172544. Its totient is φ = 377280.

The previous prime is 720101. The next prime is 720127. The reversal of 720105 is 501027.

It is a happy number.

It is not a de Polignac number, because 720105 - 2² = 720101 is a prime.

It is a super-2 number, since 2×720105² = 1037102422050, which contains 22 as substring.

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

It is a Curzon number.

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 in 15 ways as a sum of consecutive naturals, for example, 522 + ... + 1308.

It is an arithmetic number, because the mean of its divisors is an integer number (73284).

2⁷²⁰¹⁰⁵ is an apocalyptic number.

It is an amenable number.

720105 is a deficient number, since it is larger than the sum of its proper divisors (452439).

720105 is a wasteful number, since it uses less digits than its factorization.

720105 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 856.

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

The square root of 720105 is about 848.5900070116. The cubic root of 720105 is about 89.6324516406.

The spelling of 720105 in words is "seven hundred twenty thousand, one hundred five".