620781173 has 4 divisors (see below), whose sum is σ = 621209868. Its totient is φ = 620352480.

The previous prime is 620781157. The next prime is 620781179. The reversal of 620781173 is 371187026.

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

It can be written as a sum of positive squares in 2 ways, for example, as 314601169 + 306180004 = 17737^2 + 17498^2 .

It is a cyclic number.

It is not a de Polignac number, because 620781173 - 2⁴ = 620781157 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (620781179) 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 3 ways as a sum of consecutive naturals, for example, 212168 + ... + 215073.

It is an arithmetic number, because the mean of its divisors is an integer number (155302467).

Almost surely, 2^620781173 is an apocalyptic number.

It is an amenable number.

620781173 is a deficient number, since it is larger than the sum of its proper divisors (428695).

620781173 is a wasteful number, since it uses less digits than its factorization.

620781173 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 428694.

The product of its (nonzero) digits is 14112, while the sum is 35.

The square root of 620781173 is about 24915.4805893846. The cubic root of 620781173 is about 853.0598704465.

The spelling of 620781173 in words is "six hundred twenty million, seven hundred eighty-one thousand, one hundred seventy-three".