688138875132 has 12 divisors (see below), whose sum is σ = 1605657375336. Its totient is φ = 229379625040.

The previous prime is 688138875131. The next prime is 688138875139. The reversal of 688138875132 is 231578831886.

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

It is a super-2 number, since 2×688138875132² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (688138875131) 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, 28672453119 + ... + 28672453142.

It is an arithmetic number, because the mean of its divisors is an integer number (133804781278).

Almost surely, 2^688138875132 is an apocalyptic number.

It is an amenable number.

688138875132 is an abundant number, since it is smaller than the sum of its proper divisors (917518500204).

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

688138875132 is a wasteful number, since it uses less digits than its factorization.

688138875132 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57344906268 (or 57344906266 counting only the distinct ones).

The product of its digits is 15482880, while the sum is 60.

The spelling of 688138875132 in words is "six hundred eighty-eight billion, one hundred thirty-eight million, eight hundred seventy-five thousand, one hundred thirty-two".