680427621 has 40 divisors (see below), whose sum is σ = 1040866200. Its totient is φ = 442810368.

The previous prime is 680427557. The next prime is 680427623. The reversal of 680427621 is 126724086.

680427621 is a `hidden beast` number, since 6 + 8 + 0 + 4 + 27 + 621 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 165636900 + 514790721 = 12870^2 + 22689^2 .

It is not a de Polignac number, because 680427621 - 2⁶ = 680427557 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (680427623) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 1515205 + ... + 1515653.

It is an arithmetic number, because the mean of its divisors is an integer number (26021655).

Almost surely, 2^680427621 is an apocalyptic number.

It is an amenable number.

680427621 is a deficient number, since it is larger than the sum of its proper divisors (360438579).

680427621 is a wasteful number, since it uses less digits than its factorization.

680427621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 867 (or 858 counting only the distinct ones).

The product of its (nonzero) digits is 32256, while the sum is 36.

The square root of 680427621 is about 26085.0075905682. The cubic root of 680427621 is about 879.5502268551.

The spelling of 680427621 in words is "six hundred eighty million, four hundred twenty-seven thousand, six hundred twenty-one".