678434125 has 8 divisors (see below), whose sum is σ = 846685944. Its totient is φ = 542747200.

The previous prime is 678434089. The next prime is 678434129. The reversal of 678434125 is 521434876.

It can be written as a sum of positive squares in 4 ways, for example, as 11710084 + 666724041 = 3422^2 + 25821^2 .

It is not a de Polignac number, because 678434125 - 2¹¹ = 678432077 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (678434129) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2713612 + ... + 2713861.

It is an arithmetic number, because the mean of its divisors is an integer number (105835743).

Almost surely, 2^678434125 is an apocalyptic number.

It is an amenable number.

678434125 is a deficient number, since it is larger than the sum of its proper divisors (168251819).

678434125 is an equidigital number, since it uses as much as digits as its factorization.

678434125 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5427488 (or 5427478 counting only the distinct ones).

The product of its digits is 161280, while the sum is 40.

The square root of 678434125 is about 26046.7680336736. The cubic root of 678434125 is about 878.6904268655.

The spelling of 678434125 in words is "six hundred seventy-eight million, four hundred thirty-four thousand, one hundred twenty-five".