684136336 has 45 divisors (see below), whose sum is σ = 1438179249. Its totient is φ = 315127488.

The previous prime is 684136319. The next prime is 684136339. The reversal of 684136336 is 633631486.

The square root of 684136336 is 26156.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 101203600 + 582932736 = 10060^2 + 24144^2 .

It is not an unprimeable number, because it can be changed into a prime (684136339) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 1359861 + ... + 1360363.

Almost surely, 2^684136336 is an apocalyptic number.

684136336 is the 26156-th square number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 684136336

684136336 is an abundant number, since it is smaller than the sum of its proper divisors (754042913).

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

684136336 is an equidigital number, since it uses as much as digits as its factorization.

684136336 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1040 (or 518 counting only the distinct ones).

The product of its digits is 186624, while the sum is 40.

The cubic root of 684136336 is about 881.1453474907.

Multiplying 684136336 by its product of digits (186624), we get a square (127676259569664 = 11299392²).

The spelling of 684136336 in words is "six hundred eighty-four million, one hundred thirty-six thousand, three hundred thirty-six".