1620716173 has 8 divisors (see below), whose sum is σ = 1644113016. Its totient is φ = 1597478400.

The previous prime is 1620716161. The next prime is 1620716179. The reversal of 1620716173 is 3716170261.

It can be written as a sum of positive squares in 4 ways, for example, as 412164 + 1620304009 = 642^2 + 40253^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 1620716173 - 2¹³ = 1620707981 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 (1620716179) 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 7 ways as a sum of consecutive naturals, for example, 19168 + ... + 60073.

It is an arithmetic number, because the mean of its divisors is an integer number (205514127).

Almost surely, 2^1620716173 is an apocalyptic number.

It is an amenable number.

1620716173 is a deficient number, since it is larger than the sum of its proper divisors (23396843).

1620716173 is a wasteful number, since it uses less digits than its factorization.

1620716173 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 79535.

The product of its (nonzero) digits is 10584, while the sum is 34.

The square root of 1620716173 is about 40258.1193425624. The cubic root of 1620716173 is about 1174.6333361436.

The spelling of 1620716173 in words is "one billion, six hundred twenty million, seven hundred sixteen thousand, one hundred seventy-three".