678460129 has 2 divisors, whose sum is σ = 678460130. Its totient is φ = 678460128.

The previous prime is 678460121. The next prime is 678460147. The reversal of 678460129 is 921064876.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 651627729 + 26832400 = 25527^2 + 5180^2 .

It is a cyclic number.

It is not a de Polignac number, because 678460129 - 2³ = 678460121 is a prime.

It is not a weakly prime, because it can be changed into another prime (678460121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 339230064 + 339230065.

It is an arithmetic number, because the mean of its divisors is an integer number (339230065).

Almost surely, 2^678460129 is an apocalyptic number.

It is an amenable number.

678460129 is a deficient number, since it is larger than the sum of its proper divisors (1).

678460129 is an equidigital number, since it uses as much as digits as its factorization.

678460129 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 145152, while the sum is 43.

The square root of 678460129 is about 26047.2672079049. The cubic root of 678460129 is about 878.7016532927.

The spelling of 678460129 in words is "six hundred seventy-eight million, four hundred sixty thousand, one hundred twenty-nine".