305728656 has 40 divisors (see below), whose sum is σ = 790544640. Its totient is φ = 101813376.

The previous prime is 305728651. The next prime is 305728699. The reversal of 305728656 is 656827503.

It is a super-2 number, since 2×305728656² = 186940022199132672, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (305728651) 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, 63585 + ... + 68223.

It is an arithmetic number, because the mean of its divisors is an integer number (19763616).

Almost surely, 2^305728656 is an apocalyptic number.

It is an amenable number.

305728656 is an abundant number, since it is smaller than the sum of its proper divisors (484815984).

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

305728656 is a wasteful number, since it uses less digits than its factorization.

305728656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6023 (or 6017 counting only the distinct ones).

The product of its (nonzero) digits is 302400, while the sum is 42.

The square root of 305728656 is about 17485.0981123927. The cubic root of 305728656 is about 673.6671685982.

It can be divided in two parts, 3057 and 28656, that added together give a palindrome (31713).

The spelling of 305728656 in words is "three hundred five million, seven hundred twenty-eight thousand, six hundred fifty-six".