688550436 has 48 divisors (see below), whose sum is σ = 2040151680. Its totient is φ = 196728480.

The previous prime is 688550419. The next prime is 688550449. The reversal of 688550436 is 634055886.

688550436 is a `hidden beast` number, since 68 + 8 + 550 + 4 + 36 = 666.

It is a junction number, because it is equal to n+sod(n) for n = 688550391 and 688550400.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 454635 + ... + 456146.

It is an arithmetic number, because the mean of its divisors is an integer number (42503160).

Almost surely, 2^688550436 is an apocalyptic number.

It is an amenable number.

688550436 is an abundant number, since it is smaller than the sum of its proper divisors (1351601244).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

688550436 is a wasteful number, since it uses less digits than its factorization.

688550436 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 910801 (or 910793 counting only the distinct ones).

The product of its (nonzero) digits is 691200, while the sum is 45.

The square root of 688550436 is about 26240.2445872747. The cubic root of 688550436 is about 883.0363587268.

The spelling of 688550436 in words is "six hundred eighty-eight million, five hundred fifty thousand, four hundred thirty-six".