680185073 has 4 divisors (see below), whose sum is σ = 684517620. Its totient is φ = 675852528.

The previous prime is 680185063. The next prime is 680185127. The reversal of 680185073 is 370581086.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 370581086 = 2 ⋅185290543.

It can be written as a sum of positive squares in 2 ways, for example, as 81306289 + 598878784 = 9017^2 + 24472^2 .

It is a cyclic number.

It is not a de Polignac number, because 680185073 - 2⁴ = 680185057 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (680185063) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2166038 + ... + 2166351.

It is an arithmetic number, because the mean of its divisors is an integer number (171129405).

Almost surely, 2^680185073 is an apocalyptic number.

It is an amenable number.

680185073 is a deficient number, since it is larger than the sum of its proper divisors (4332547).

680185073 is a wasteful number, since it uses less digits than its factorization.

680185073 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4332546.

The product of its (nonzero) digits is 40320, while the sum is 38.

The square root of 680185073 is about 26080.3579921749. The cubic root of 680185073 is about 879.4457050831.

The spelling of 680185073 in words is "six hundred eighty million, one hundred eighty-five thousand, seventy-three".