685394450 has 48 divisors (see below), whose sum is σ = 1375927560. Its totient is φ = 252510720.

The previous prime is 685394419. The next prime is 685394461. The reversal of 685394450 is 54493586.

It can be written as a sum of positive squares in 12 ways, for example, as 114041041 + 571353409 = 10679^2 + 23903^2 .

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 400196 + ... + 401904.

Almost surely, 2^685394450 is an apocalyptic number.

685394450 is an abundant number, since it is smaller than the sum of its proper divisors (690533110).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

685394450 is a wasteful number, since it uses less digits than its factorization.

685394450 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2351 (or 2346 counting only the distinct ones).

The product of its (nonzero) digits is 518400, while the sum is 44.

The square root of 685394450 is about 26180.0391519952. The cubic root of 685394450 is about 881.6851533644.

The spelling of 685394450 in words is "six hundred eighty-five million, three hundred ninety-four thousand, four hundred fifty".