1720656213 has 8 divisors (see below), whose sum is σ = 2294964768. Its totient is φ = 1146725904.

The previous prime is 1720656191. The next prime is 1720656221. The reversal of 1720656213 is 3126560271.

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

It is not a de Polignac number, because 1720656213 - 2⁶ = 1720656149 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1720656253) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 83770 + ... + 102267.

It is an arithmetic number, because the mean of its divisors is an integer number (286870596).

Almost surely, 2^1720656213 is an apocalyptic number.

It is an amenable number.

1720656213 is a deficient number, since it is larger than the sum of its proper divisors (574308555).

1720656213 is a wasteful number, since it uses less digits than its factorization.

1720656213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 189123.

The product of its (nonzero) digits is 15120, while the sum is 33.

The square root of 1720656213 is about 41480.7933024430. The cubic root of 1720656213 is about 1198.2976354099.

The spelling of 1720656213 in words is "one billion, seven hundred twenty million, six hundred fifty-six thousand, two hundred thirteen".