305072081 has 8 divisors (see below), whose sum is σ = 314037864. Its totient is φ = 296225280.

The previous prime is 305072077. The next prime is 305072101. The reversal of 305072081 is 180270503.

It can be written as a sum of positive squares in 4 ways, for example, as 16072081 + 289000000 = 4009^2 + 17000^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 305072081 - 2² = 305072077 is a prime.

It is a super-2 number, since 2×305072081² = 186137949211341122, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 305072081.

It is not an unprimeable number, because it can be changed into a prime (305072051) 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, 24530 + ... + 34811.

It is an arithmetic number, because the mean of its divisors is an integer number (39254733).

Almost surely, 2^305072081 is an apocalyptic number.

It is an amenable number.

305072081 is a deficient number, since it is larger than the sum of its proper divisors (8965783).

305072081 is an equidigital number, since it uses as much as digits as its factorization.

305072081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 59491.

The product of its (nonzero) digits is 1680, while the sum is 26.

The square root of 305072081 is about 17466.3127476866. The cubic root of 305072081 is about 673.1845728669.

The spelling of 305072081 in words is "three hundred five million, seventy-two thousand, eighty-one".