680033621 has 4 divisors (see below), whose sum is σ = 680918700. Its totient is φ = 679148544.

The previous prime is 680033611. The next prime is 680033681. The reversal of 680033621 is 126330086.

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 433888900 + 246144721 = 20830^2 + 15689^2 .

It is a cyclic number.

It is not a de Polignac number, because 680033621 - 2²⁶ = 612924757 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (680033611) 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, 441386 + ... + 442923.

It is an arithmetic number, because the mean of its divisors is an integer number (170229675).

Almost surely, 2^680033621 is an apocalyptic number.

It is an amenable number.

680033621 is a deficient number, since it is larger than the sum of its proper divisors (885079).

680033621 is an equidigital number, since it uses as much as digits as its factorization.

680033621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 885078.

The product of its (nonzero) digits is 5184, while the sum is 29.

The square root of 680033621 is about 26077.4542660897. The cubic root of 680033621 is about 879.3804269193.

The spelling of 680033621 in words is "six hundred eighty million, thirty-three thousand, six hundred twenty-one".