685895450 has 12 divisors (see below), whose sum is σ = 1275765630. Its totient is φ = 274358160.

The previous prime is 685895389. The next prime is 685895453. The reversal of 685895450 is 54598586.

It can be written as a sum of positive squares in 3 ways, for example, as 275792449 + 410103001 = 16607^2 + 20251^2 .

It is a Harshad number since it is a multiple of its sum of digits (50), and also a Moran number because the ratio is a prime number: 13717909 = 685895450 / (6 + 8 + 5 + 8 + 9 + 5 + 4 + 5 + 0).

It is not an unprimeable number, because it can be changed into a prime (685895453) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 6858905 + ... + 6859004.

Almost surely, 2^685895450 is an apocalyptic number.

685895450 is a deficient number, since it is larger than the sum of its proper divisors (589870180).

685895450 is a wasteful number, since it uses less digits than its factorization.

685895450 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13717921 (or 13717916 counting only the distinct ones).

The product of its (nonzero) digits is 1728000, while the sum is 50.

The square root of 685895450 is about 26189.6057625922. The cubic root of 685895450 is about 881.8999283148.

The spelling of 685895450 in words is "six hundred eighty-five million, eight hundred ninety-five thousand, four hundred fifty".