688722036 has 12 divisors (see below), whose sum is σ = 1607018112. Its totient is φ = 229574008.

The previous prime is 688722017. The next prime is 688722043. The reversal of 688722036 is 630227886.

It is a tau number, because it is divible by the number of its divisors (12).

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors.

It is a congruent number.

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 3 ways as a sum of consecutive naturals, for example, 28696740 + ... + 28696763.

It is an arithmetic number, because the mean of its divisors is an integer number (133918176).

Almost surely, 2^688722036 is an apocalyptic number.

It is an amenable number.

688722036 is an abundant number, since it is smaller than the sum of its proper divisors (918296076).

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

688722036 is a wasteful number, since it uses less digits than its factorization.

688722036 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 57393510 (or 57393508 counting only the distinct ones).

The product of its (nonzero) digits is 193536, while the sum is 42.

The square root of 688722036 is about 26243.5141701716. The cubic root of 688722036 is about 883.1097091768.

The spelling of 688722036 in words is "six hundred eighty-eight million, seven hundred twenty-two thousand, thirty-six".