686428073 has 2 divisors, whose sum is σ = 686428074. Its totient is φ = 686428072.

The previous prime is 686428051. The next prime is 686428081. The reversal of 686428073 is 370824686.

686428073 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 533979664 + 152448409 = 23108^2 + 12347^2 .

It is a cyclic number.

It is not a de Polignac number, because 686428073 - 2²⁴ = 669650857 is a prime.

It is not a weakly prime, because it can be changed into another prime (686424073) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 343214036 + 343214037.

It is an arithmetic number, because the mean of its divisors is an integer number (343214037).

Almost surely, 2^686428073 is an apocalyptic number.

It is an amenable number.

686428073 is a deficient number, since it is larger than the sum of its proper divisors (1).

686428073 is an equidigital number, since it uses as much as digits as its factorization.

686428073 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 387072, while the sum is 44.

The square root of 686428073 is about 26199.7723845075. The cubic root of 686428073 is about 882.1281451433.

The spelling of 686428073 in words is "six hundred eighty-six million, four hundred twenty-eight thousand, seventy-three".