685522407 has 4 divisors (see below), whose sum is σ = 914029880. Its totient is φ = 457014936.

The previous prime is 685522363. The next prime is 685522423. The reversal of 685522407 is 704225586.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 685522407 - 2¹² = 685518311 is a prime.

It is a super-4 number, since 4×685522407⁴ (a number of 36 digits) contains 4444 as substring. Note that it is a super-d number also for d = 3.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (685522447) 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, 114253732 + ... + 114253737.

It is an arithmetic number, because the mean of its divisors is an integer number (228507470).

Almost surely, 2^685522407 is an apocalyptic number.

685522407 is a deficient number, since it is larger than the sum of its proper divisors (228507473).

685522407 is a wasteful number, since it uses less digits than its factorization.

685522407 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 228507472.

The product of its (nonzero) digits is 134400, while the sum is 39.

The square root of 685522407 is about 26182.4828272645. The cubic root of 685522407 is about 881.7400175219.

The spelling of 685522407 in words is "six hundred eighty-five million, five hundred twenty-two thousand, four hundred seven".