678489927025 has 27 divisors (see below), whose sum is σ = 847713118539. Its totient is φ = 538703070000.

The previous prime is 678489926999. The next prime is 678489927067. The reversal of 678489927025 is 520729984876.

The square root of 678489927025 is 823705.

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

It can be written as a sum of positive squares in only one way, i.e., 244256373729 + 434233553296 = 494223^2 + 658964^2 .

It is not a de Polignac number, because 678489927025 - 2²³ = 678481538417 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 621896730 + ... + 621897820.

Almost surely, 2^678489927025 is an apocalyptic number.

678489927025 is the 823705-th square number.

678489927025 is the 411853-rd centered octagonal number.

It is an amenable number.

678489927025 is a deficient number, since it is larger than the sum of its proper divisors (169223191514).

678489927025 is an frugal number, since it uses more digits than its factorization.

678489927025 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2494 (or 1247 counting only the distinct ones).

The product of its (nonzero) digits is 121927680, while the sum is 67.

The spelling of 678489927025 in words is "six hundred seventy-eight billion, four hundred eighty-nine million, nine hundred twenty-seven thousand, twenty-five".