688744092 has 12 divisors (see below), whose sum is σ = 1607069576. Its totient is φ = 229581360.

The previous prime is 688744079. The next prime is 688744093. The reversal of 688744092 is 290447886.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (688744093) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 28697659 + ... + 28697682.

Almost surely, 2^688744092 is an apocalyptic number.

It is an amenable number.

688744092 is an abundant number, since it is smaller than the sum of its proper divisors (918325484).

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

688744092 is a wasteful number, since it uses less digits than its factorization.

688744092 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57395348 (or 57395346 counting only the distinct ones).

The product of its (nonzero) digits is 774144, while the sum is 48.

The square root of 688744092 is about 26243.9343849203. The cubic root of 688744092 is about 883.1191361342.

The spelling of 688744092 in words is "six hundred eighty-eight million, seven hundred forty-four thousand, ninety-two".