680224821 has 4 divisors (see below), whose sum is σ = 906966432. Its totient is φ = 453483212.

The previous prime is 680224817. The next prime is 680224823. The reversal of 680224821 is 128422086.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 680224821 - 2² = 680224817 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (680224823) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 113370801 + ... + 113370806.

It is an arithmetic number, because the mean of its divisors is an integer number (226741608).

Almost surely, 2^680224821 is an apocalyptic number.

It is an amenable number.

680224821 is a deficient number, since it is larger than the sum of its proper divisors (226741611).

680224821 is a wasteful number, since it uses less digits than its factorization.

680224821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 226741610.

The product of its (nonzero) digits is 12288, while the sum is 33.

The square root of 680224821 is about 26081.1200104597. The cubic root of 680224821 is about 879.4628354831.

The spelling of 680224821 in words is "six hundred eighty million, two hundred twenty-four thousand, eight hundred twenty-one".