684002626420 has 24 divisors (see below), whose sum is σ = 1439722867464. Its totient is φ = 272969174016.

The previous prime is 684002626399. The next prime is 684002626423. The reversal of 684002626420 is 24626200486.

It can be written as a sum of positive squares in 4 ways, for example, as 7993075216 + 676009551204 = 89404^2 + 822198^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (684002626423) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 39483409 + ... + 39500728.

It is an arithmetic number, because the mean of its divisors is an integer number (59988452811).

Almost surely, 2^684002626420 is an apocalyptic number.

It is an amenable number.

684002626420 is an abundant number, since it is smaller than the sum of its proper divisors (755720241044).

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

684002626420 is a wasteful number, since it uses less digits than its factorization.

684002626420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 78984579 (or 78984577 counting only the distinct ones).

The product of its (nonzero) digits is 221184, while the sum is 40.

The spelling of 684002626420 in words is "six hundred eighty-four billion, two million, six hundred twenty-six thousand, four hundred twenty".