678741629 has 2 divisors, whose sum is σ = 678741630. Its totient is φ = 678741628.

The previous prime is 678741529. The next prime is 678741667. The reversal of 678741629 is 926147876.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 678602500 + 139129 = 26050^2 + 373^2 .

It is a cyclic number.

It is not a de Polignac number, because 678741629 - 2²⁰ = 677693053 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 (678741029) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 339370814 + 339370815.

It is an arithmetic number, because the mean of its divisors is an integer number (339370815).

Almost surely, 2^678741629 is an apocalyptic number.

It is an amenable number.

678741629 is a deficient number, since it is larger than the sum of its proper divisors (1).

678741629 is an equidigital number, since it uses as much as digits as its factorization.

678741629 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1016064, while the sum is 50.

The square root of 678741629 is about 26052.6702854045. The cubic root of 678741629 is about 878.8231639032.

The spelling of 678741629 in words is "six hundred seventy-eight million, seven hundred forty-one thousand, six hundred twenty-nine".