684838433690 has 32 divisors (see below), whose sum is σ = 1244139676560. Its totient is φ = 271395753984.

The previous prime is 684838433689. The next prime is 684838433701. The reversal of 684838433690 is 96334838486.

It is a happy number.

It can be written as a sum of positive squares in 8 ways, for example, as 506988144961 + 177850288729 = 712031^2 + 421723^2 .

It is a super-2 number, since 2×684838433690² (a number of 24 digits) contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 14186234 + ... + 14234426.

Almost surely, 2^684838433690 is an apocalyptic number.

684838433690 is a deficient number, since it is larger than the sum of its proper divisors (559301242870).

684838433690 is a wasteful number, since it uses less digits than its factorization.

684838433690 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 61346.

The product of its (nonzero) digits is 71663616, while the sum is 62.

The spelling of 684838433690 in words is "six hundred eighty-four billion, eight hundred thirty-eight million, four hundred thirty-three thousand, six hundred ninety".