305721064 has 32 divisors (see below), whose sum is σ = 662126400. Its totient is φ = 130789120.

The previous prime is 305721061. The next prime is 305721079. The reversal of 305721064 is 460127503.

It is not an unprimeable number, because it can be changed into a prime (305721061) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 100684 + ... + 103675.

It is an arithmetic number, because the mean of its divisors is an integer number (20691450).

Almost surely, 2^305721064 is an apocalyptic number.

305721064 is a gapful number since it is divisible by the number (34) formed by its first and last digit.

It is an amenable number.

305721064 is an abundant number, since it is smaller than the sum of its proper divisors (356405336).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

305721064 is a wasteful number, since it uses less digits than its factorization.

305721064 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 204393 (or 204389 counting only the distinct ones).

The product of its (nonzero) digits is 5040, while the sum is 28.

The square root of 305721064 is about 17484.8810118914. The cubic root of 305721064 is about 673.6615922770.

Adding to 305721064 its reverse (460127503), we get a palindrome (765848567).

The spelling of 305721064 in words is "three hundred five million, seven hundred twenty-one thousand, sixty-four".