688145972 has 12 divisors (see below), whose sum is σ = 1204746816. Its totient is φ = 343932600.

The previous prime is 688145957. The next prime is 688145999. The reversal of 688145972 is 279541886.

It is a self number, because there is not a number n which added to its sum of digits gives 688145972.

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, 23654 + ... + 43997.

It is an arithmetic number, because the mean of its divisors is an integer number (100395568).

Almost surely, 2^688145972 is an apocalyptic number.

It is an amenable number.

688145972 is a deficient number, since it is larger than the sum of its proper divisors (516600844).

688145972 is a wasteful number, since it uses less digits than its factorization.

688145972 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 70198 (or 70196 counting only the distinct ones).

The product of its digits is 967680, while the sum is 50.

The square root of 688145972 is about 26232.5365147940. The cubic root of 688145972 is about 882.8634222917.

The spelling of 688145972 in words is "six hundred eighty-eight million, one hundred forty-five thousand, nine hundred seventy-two".