320608821 has 16 divisors (see below), whose sum is σ = 464836736. Its totient is φ = 195379776.

The previous prime is 320608801. The next prime is 320608823. The reversal of 320608821 is 128806023.

It is not a de Polignac number, because 320608821 - 2¹¹ = 320606773 is a prime.

It is a super-2 number, since 2×320608821² = 205580032206020082, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (320608823) 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 15 ways as a sum of consecutive naturals, for example, 35890 + ... + 43923.

It is an arithmetic number, because the mean of its divisors is an integer number (29052296).

Almost surely, 2^320608821 is an apocalyptic number.

It is an amenable number.

320608821 is a deficient number, since it is larger than the sum of its proper divisors (144227915).

320608821 is a wasteful number, since it uses less digits than its factorization.

320608821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 79932.

The product of its (nonzero) digits is 4608, while the sum is 30.

The square root of 320608821 is about 17905.5527979451. The cubic root of 320608821 is about 684.4238827243.

The spelling of 320608821 in words is "three hundred twenty million, six hundred eight thousand, eight hundred twenty-one".