680821065 has 32 divisors (see below), whose sum is σ = 1212359040. Its totient is φ = 362501568.

The previous prime is 680821033. The next prime is 680821067. The reversal of 680821065 is 560128086.

It is a happy number.

It is not a de Polignac number, because 680821065 - 2⁵ = 680821033 is a prime.

It is not an unprimeable number, because it can be changed into a prime (680821067) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 84294 + ... + 92016.

It is an arithmetic number, because the mean of its divisors is an integer number (37886220).

Almost surely, 2^680821065 is an apocalyptic number.

It is an amenable number.

680821065 is a deficient number, since it is larger than the sum of its proper divisors (531537975).

680821065 is a wasteful number, since it uses less digits than its factorization.

680821065 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8390 (or 8384 counting only the distinct ones).

The product of its (nonzero) digits is 23040, while the sum is 36.

The square root of 680821065 is about 26092.5480741150. The cubic root of 680821065 is about 879.7197217779.

The spelling of 680821065 in words is "six hundred eighty million, eight hundred twenty-one thousand, sixty-five".