684364638 has 16 divisors (see below), whose sum is σ = 1371522816. Its totient is φ = 227655960.

The previous prime is 684364633. The next prime is 684364687. The reversal of 684364638 is 836463486.

684364638 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-3 number, since 3×684364638³ (a number of 27 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (684364633) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 113206 + ... + 119097.

It is an arithmetic number, because the mean of its divisors is an integer number (85720176).

Almost surely, 2^684364638 is an apocalyptic number.

684364638 is an abundant number, since it is smaller than the sum of its proper divisors (687158178).

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

684364638 is a wasteful number, since it uses less digits than its factorization.

684364638 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 232799.

The product of its digits is 1990656, while the sum is 48.

The square root of 684364638 is about 26160.3638736161. The cubic root of 684364638 is about 881.2433517732.

The spelling of 684364638 in words is "six hundred eighty-four million, three hundred sixty-four thousand, six hundred thirty-eight".