305720481 has 16 divisors (see below), whose sum is σ = 459030528. Its totient is φ = 179307600.

The previous prime is 305720479. The next prime is 305720509. The reversal of 305720481 is 184027503.

It is not a de Polignac number, because 305720481 - 2¹ = 305720479 is a prime.

It is a super-2 number, since 2×305720481² = 186930025005742722, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (305720461) 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, 148401 + ... + 150446.

It is an arithmetic number, because the mean of its divisors is an integer number (28689408).

Almost surely, 2^305720481 is an apocalyptic number.

305720481 is a gapful number since it is divisible by the number (31) formed by its first and last digit.

It is an amenable number.

305720481 is a deficient number, since it is larger than the sum of its proper divisors (153310047).

305720481 is a wasteful number, since it uses less digits than its factorization.

305720481 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 298892.

The product of its (nonzero) digits is 6720, while the sum is 30.

The square root of 305720481 is about 17484.8643403373. The cubic root of 305720481 is about 673.6611640600.

Adding to 305720481 its reverse (184027503), we get a palindrome (489747984).

The spelling of 305720481 in words is "three hundred five million, seven hundred twenty thousand, four hundred eighty-one".