680405626 has 16 divisors (see below), whose sum is σ = 1043664264. Its totient is φ = 332564544.

The previous prime is 680405563. The next prime is 680405629. The reversal of 680405626 is 626504086.

It can be written as a sum of positive squares in 4 ways, for example, as 331276401 + 349129225 = 18201^2 + 18685^2 .

It is not an unprimeable number, because it can be changed into a prime (680405629) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 17776 + ... + 40948.

Almost surely, 2^680405626 is an apocalyptic number.

680405626 is a deficient number, since it is larger than the sum of its proper divisors (363258638).

680405626 is a wasteful number, since it uses less digits than its factorization.

680405626 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23505.

The product of its (nonzero) digits is 69120, while the sum is 37.

The square root of 680405626 is about 26084.5859848302. The cubic root of 680405626 is about 879.5407495230.

The spelling of 680405626 in words is "six hundred eighty million, four hundred five thousand, six hundred twenty-six".