678660525 has 120 divisors (see below), whose sum is σ = 1368364800. Its totient is φ = 331257600.

The previous prime is 678660491. The next prime is 678660527. The reversal of 678660525 is 525066876.

678660525 is a `hidden beast` number, since 67 + 8 + 6 + 60 + 525 = 666.

678660525 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 678660525 - 2⁶ = 678660461 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (678660527) by changing a digit.

It is a polite number, since it can be written in 119 ways as a sum of consecutive naturals, for example, 1192441 + ... + 1193009.

It is an arithmetic number, because the mean of its divisors is an integer number (11403040).

Almost surely, 2^678660525 is an apocalyptic number.

It is an amenable number.

678660525 is an abundant number, since it is smaller than the sum of its proper divisors (689704275).

678660525 is a wasteful number, since it uses less digits than its factorization.

678660525 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 641 (or 627 counting only the distinct ones).

The product of its (nonzero) digits is 604800, while the sum is 45.

The square root of 678660525 is about 26051.1136998018. The cubic root of 678660525 is about 878.7881584804.

The spelling of 678660525 in words is "six hundred seventy-eight million, six hundred sixty thousand, five hundred twenty-five".