678888389 has 2 divisors, whose sum is σ = 678888390. Its totient is φ = 678888388.

The previous prime is 678888383. The next prime is 678888403. The reversal of 678888389 is 983888876.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 666930625 + 11957764 = 25825^2 + 3458^2 .

It is a cyclic number.

It is not a de Polignac number, because 678888389 - 2¹² = 678884293 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (678888383) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 339444194 + 339444195.

It is an arithmetic number, because the mean of its divisors is an integer number (339444195).

Almost surely, 2^678888389 is an apocalyptic number.

It is an amenable number.

678888389 is a deficient number, since it is larger than the sum of its proper divisors (1).

678888389 is an equidigital number, since it uses as much as digits as its factorization.

678888389 is an evil number, because the sum of its binary digits is even.

The product of its digits is 37158912, while the sum is 65.

The square root of 678888389 is about 26055.4867350430. The cubic root of 678888389 is about 878.8865001258.

The spelling of 678888389 in words is "six hundred seventy-eight million, eight hundred eighty-eight thousand, three hundred eighty-nine".