685646797 has 16 divisors (see below), whose sum is σ = 775656000. Its totient is φ = 600355840.

The previous prime is 685646783. The next prime is 685646807. The reversal of 685646797 is 797646586.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 685646797 - 2²⁷ = 551429069 is a prime.

It is a super-2 number, since 2×685646797² = 940223060472718418, 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 (685646197) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 140838 + ... + 145624.

It is an arithmetic number, because the mean of its divisors is an integer number (48478500).

Almost surely, 2^685646797 is an apocalyptic number.

It is an amenable number.

685646797 is a deficient number, since it is larger than the sum of its proper divisors (90009203).

685646797 is a wasteful number, since it uses less digits than its factorization.

685646797 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5276.

The product of its digits is 15240960, while the sum is 58.

The square root of 685646797 is about 26184.8581626863. The cubic root of 685646797 is about 881.7933457119.

The spelling of 685646797 in words is "six hundred eighty-five million, six hundred forty-six thousand, seven hundred ninety-seven".