680004445 has 4 divisors (see below), whose sum is σ = 816005340. Its totient is φ = 544003552.

The previous prime is 680004443. The next prime is 680004467. The reversal of 680004445 is 544400086.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 544400086 = 2 ⋅272200043.

It can be written as a sum of positive squares in 2 ways, for example, as 151142436 + 528862009 = 12294^2 + 22997^2 .

It is a cyclic number.

It is not a de Polignac number, because 680004445 - 2¹ = 680004443 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (680004443) 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, 68000440 + ... + 68000449.

It is an arithmetic number, because the mean of its divisors is an integer number (204001335).

Almost surely, 2^680004445 is an apocalyptic number.

It is an amenable number.

680004445 is a deficient number, since it is larger than the sum of its proper divisors (136000895).

680004445 is a wasteful number, since it uses less digits than its factorization.

680004445 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 136000894.

The product of its (nonzero) digits is 15360, while the sum is 31.

The square root of 680004445 is about 26076.8948496557. The cubic root of 680004445 is about 879.3678504969.

The spelling of 680004445 in words is "six hundred eighty million, four thousand, four hundred forty-five".