686568628 has 6 divisors (see below), whose sum is σ = 1201495106. Its totient is φ = 343284312.

The previous prime is 686568593. The next prime is 686568637. The reversal of 686568628 is 826865686.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 577825444 + 108743184 = 24038^2 + 10428^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 85821075 + ... + 85821082.

Almost surely, 2^686568628 is an apocalyptic number.

It is an amenable number.

686568628 is a deficient number, since it is larger than the sum of its proper divisors (514926478).

686568628 is a wasteful number, since it uses less digits than its factorization.

686568628 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 171642161 (or 171642159 counting only the distinct ones).

The product of its digits is 6635520, while the sum is 55.

The square root of 686568628 is about 26202.4546178407. The cubic root of 686568628 is about 882.1883500721.

It can be divided in two parts, 68656 and 8628, that added together give a square (77284 = 278²).

The spelling of 686568628 in words is "six hundred eighty-six million, five hundred sixty-eight thousand, six hundred twenty-eight".