684575730 has 24 divisors (see below), whose sum is σ = 1779897132. Its totient is φ = 182553504.

The previous prime is 684575701. The next prime is 684575747. The reversal of 684575730 is 37575486.

684575730 is a `hidden beast` number, since 6 + 8 + 4 + 575 + 73 + 0 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 637007121 + 47568609 = 25239^2 + 6897^2 .

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a Curzon number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3803109 + ... + 3803288.

Almost surely, 2^684575730 is an apocalyptic number.

684575730 is an abundant number, since it is smaller than the sum of its proper divisors (1095321402).

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

684575730 is a wasteful number, since it uses less digits than its factorization.

684575730 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7606410 (or 7606407 counting only the distinct ones).

The product of its (nonzero) digits is 705600, while the sum is 45.

The square root of 684575730 is about 26164.3981394566. The cubic root of 684575730 is about 881.3339488459. Note that the first 3 decimals are identical.

The spelling of 684575730 in words is "six hundred eighty-four million, five hundred seventy-five thousand, seven hundred thirty".