680858621 has 4 divisors (see below), whose sum is σ = 681870972. Its totient is φ = 679846272.

The previous prime is 680858609. The next prime is 680858639. The reversal of 680858621 is 126858086.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 375972100 + 304886521 = 19390^2 + 17461^2 .

It is a cyclic number.

It is not a de Polignac number, because 680858621 - 2¹⁴ = 680842237 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (680858641) 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, 505166 + ... + 506511.

It is an arithmetic number, because the mean of its divisors is an integer number (170467743).

Almost surely, 2^680858621 is an apocalyptic number.

It is an amenable number.

680858621 is a deficient number, since it is larger than the sum of its proper divisors (1012351).

680858621 is a wasteful number, since it uses less digits than its factorization.

680858621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1012350.

The product of its (nonzero) digits is 184320, while the sum is 44.

The square root of 680858621 is about 26093.2677332679. The cubic root of 680858621 is about 879.7358974165.

The spelling of 680858621 in words is "six hundred eighty million, eight hundred fifty-eight thousand, six hundred twenty-one".