685678837 has 2 divisors, whose sum is σ = 685678838. Its totient is φ = 685678836.

The previous prime is 685678831. The next prime is 685678883. The reversal of 685678837 is 738876586.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 682985956 + 2692881 = 26134^2 + 1641^2 .

It is a cyclic number.

It is not a de Polignac number, because 685678837 - 2¹⁹ = 685154549 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (685678831) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 342839418 + 342839419.

It is an arithmetic number, because the mean of its divisors is an integer number (342839419).

Almost surely, 2^685678837 is an apocalyptic number.

It is an amenable number.

685678837 is a deficient number, since it is larger than the sum of its proper divisors (1).

685678837 is an equidigital number, since it uses as much as digits as its factorization.

685678837 is an evil number, because the sum of its binary digits is even.

The product of its digits is 13547520, while the sum is 58.

The square root of 685678837 is about 26185.4699595023. The cubic root of 685678837 is about 881.8070807812.

The spelling of 685678837 in words is "six hundred eighty-five million, six hundred seventy-eight thousand, eight hundred thirty-seven".