685366407 has 32 divisors (see below), whose sum is σ = 1172828160. Its totient is φ = 390936960.

The previous prime is 685366369. The next prime is 685366411. The reversal of 685366407 is 704663586.

It is not a de Polignac number, because 685366407 - 2¹⁴ = 685350023 is a prime.

It is a super-2 number, since 2×685366407² = 939454223688179298, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (685366417) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 62823 + ... + 72920.

It is an arithmetic number, because the mean of its divisors is an integer number (36650880).

Almost surely, 2^685366407 is an apocalyptic number.

685366407 is a deficient number, since it is larger than the sum of its proper divisors (487461753).

685366407 is a wasteful number, since it uses less digits than its factorization.

685366407 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 135780 (or 135774 counting only the distinct ones).

The product of its (nonzero) digits is 725760, while the sum is 45.

The square root of 685366407 is about 26179.5035667218. The cubic root of 685366407 is about 881.6731284474.

The spelling of 685366407 in words is "six hundred eighty-five million, three hundred sixty-six thousand, four hundred seven".