688288028 has 12 divisors (see below), whose sum is σ = 1207957800. Its totient is φ = 343157232.

The previous prime is 688287989. The next prime is 688288039. The reversal of 688288028 is 820882886.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 245126 + ... + 247917.

It is an arithmetic number, because the mean of its divisors is an integer number (100663150).

Almost surely, 2^688288028 is an apocalyptic number.

It is an amenable number.

688288028 is a deficient number, since it is larger than the sum of its proper divisors (519669772).

688288028 is a wasteful number, since it uses less digits than its factorization.

688288028 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 493396 (or 493394 counting only the distinct ones).

The product of its (nonzero) digits is 786432, while the sum is 50.

The square root of 688288028 is about 26235.2440049640. The cubic root of 688288028 is about 882.9241688108.

The spelling of 688288028 in words is "six hundred eighty-eight million, two hundred eighty-eight thousand, twenty-eight".