305720428 has 12 divisors (see below), whose sum is σ = 576165520. Its totient is φ = 141101712.

The previous prime is 305720399. The next prime is 305720447. The reversal of 305720428 is 824027503.

It is a self number, because there is not a number n which added to its sum of digits gives 305720428.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2939568 + ... + 2939671.

Almost surely, 2^305720428 is an apocalyptic number.

It is an amenable number.

305720428 is a deficient number, since it is larger than the sum of its proper divisors (270445092).

305720428 is a wasteful number, since it uses less digits than its factorization.

305720428 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5879256 (or 5879254 counting only the distinct ones).

The product of its (nonzero) digits is 13440, while the sum is 31.

The square root of 305720428 is about 17484.8628247407. The cubic root of 305720428 is about 673.6611251311.

The spelling of 305720428 in words is "three hundred five million, seven hundred twenty thousand, four hundred twenty-eight".