684085450 has 12 divisors (see below), whose sum is σ = 1272399030. Its totient is φ = 273634160.

The previous prime is 684085447. The next prime is 684085483. The reversal of 684085450 is 54580486.

It can be written as a sum of positive squares in 3 ways, for example, as 423166041 + 260919409 = 20571^2 + 16153^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 6840805 + ... + 6840904.

Almost surely, 2^684085450 is an apocalyptic number.

684085450 is a deficient number, since it is larger than the sum of its proper divisors (588313580).

684085450 is a wasteful number, since it uses less digits than its factorization.

684085450 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13681721 (or 13681716 counting only the distinct ones).

The product of its (nonzero) digits is 153600, while the sum is 40.

The square root of 684085450 is about 26155.0272414310. The cubic root of 684085450 is about 881.1235004448.

The spelling of 684085450 in words is "six hundred eighty-four million, eighty-five thousand, four hundred fifty".