678342025 has 9 divisors (see below), whose sum is σ = 841305621. Its totient is φ = 542569440.

The previous prime is 678342011. The next prime is 678342043. The reversal of 678342025 is 520243876.

The square root of 678342025 is 26045.

It is a perfect power (a square), and thus also a powerful number.

678342025 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 158684409 + 519657616 = 12597^2 + 22796^2 .

It is not a de Polignac number, because 678342025 - 2⁹ = 678341513 is a prime.

It is a super-2 number, since 2×678342025² = 920295805762201250, which contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 127621 + ... + 132829.

Almost surely, 2^678342025 is an apocalyptic number.

678342025 is the 26045-th square number.

678342025 is the 13023-rd centered octagonal number.

It is an amenable number.

678342025 is a deficient number, since it is larger than the sum of its proper divisors (162963596).

678342025 is an frugal number, since it uses more digits than its factorization.

678342025 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10428 (or 5214 counting only the distinct ones).

The product of its (nonzero) digits is 80640, while the sum is 37.

The cubic root of 678342025 is about 878.6506632158.

The spelling of 678342025 in words is "six hundred seventy-eight million, three hundred forty-two thousand, twenty-five".