684028799 has 2 divisors, whose sum is σ = 684028800. Its totient is φ = 684028798.

The previous prime is 684028781. The next prime is 684028801. The reversal of 684028799 is 997820486.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 684028799 - 2¹⁶ = 683963263 is a prime.

It is a super-2 number, since 2×684028799² = 935790795722764802, which contains 22 as substring.

Together with 684028801, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 684028799.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (684028729) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 342014399 + 342014400.

It is an arithmetic number, because the mean of its divisors is an integer number (342014400).

Almost surely, 2^684028799 is an apocalyptic number.

684028799 is a deficient number, since it is larger than the sum of its proper divisors (1).

684028799 is an equidigital number, since it uses as much as digits as its factorization.

684028799 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1741824, while the sum is 53.

The square root of 684028799 is about 26153.9442340921. The cubic root of 684028799 is about 881.0991770188.

The spelling of 684028799 in words is "six hundred eighty-four million, twenty-eight thousand, seven hundred ninety-nine".