688545225 has 48 divisors (see below), whose sum is σ = 1269313600. Its totient is φ = 365938560.

The previous prime is 688545191. The next prime is 688545229. The reversal of 688545225 is 522545886.

It is a happy number.

688545225 is a `hidden beast` number, since 6 + 88 + 545 + 2 + 25 = 666.

It is not a de Polignac number, because 688545225 - 2⁷ = 688545097 is a prime.

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

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

It is not an unprimeable number, because it can be changed into a prime (688545229) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 209646 + ... + 212904.

Almost surely, 2^688545225 is an apocalyptic number.

It is an amenable number.

688545225 is a deficient number, since it is larger than the sum of its proper divisors (580768375).

688545225 is a wasteful number, since it uses less digits than its factorization.

688545225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3591 (or 3580 counting only the distinct ones).

The product of its digits is 768000, while the sum is 45.

The square root of 688545225 is about 26240.1452930429. The cubic root of 688545225 is about 883.0341310933.

The spelling of 688545225 in words is "six hundred eighty-eight million, five hundred forty-five thousand, two hundred twenty-five".