620730181 has 8 divisors (see below), whose sum is σ = 643630680. Its totient is φ = 597929472.

The previous prime is 620730179. The next prime is 620730211. The reversal of 620730181 is 181037026.

It can be written as a sum of positive squares in 4 ways, for example, as 44009956 + 576720225 = 6634^2 + 24015^2 .

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 620730181 - 2¹ = 620730179 is a prime.

It is a super-2 number, since 2×620730181² = 770611915208585522, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (620730101) 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, 12160 + ... + 37273.

It is an arithmetic number, because the mean of its divisors is an integer number (80453835).

Almost surely, 2^620730181 is an apocalyptic number.

It is an amenable number.

620730181 is a deficient number, since it is larger than the sum of its proper divisors (22900499).

620730181 is a wasteful number, since it uses less digits than its factorization.

620730181 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49895.

The product of its (nonzero) digits is 2016, while the sum is 28.

The square root of 620730181 is about 24914.4572688229. The cubic root of 620730181 is about 853.0365125538.

The spelling of 620730181 in words is "six hundred twenty million, seven hundred thirty thousand, one hundred eighty-one".