305680457 has 2 divisors, whose sum is σ = 305680458. Its totient is φ = 305680456.

The previous prime is 305680423. The next prime is 305680477. The reversal of 305680457 is 754086503.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 200392336 + 105288121 = 14156^2 + 10261^2 .

It is a cyclic number.

It is not a de Polignac number, because 305680457 - 2⁶ = 305680393 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 305680457.

It is not a weakly prime, because it can be changed into another prime (305680477) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 152840228 + 152840229.

It is an arithmetic number, because the mean of its divisors is an integer number (152840229).

Almost surely, 2^305680457 is an apocalyptic number.

It is an amenable number.

305680457 is a deficient number, since it is larger than the sum of its proper divisors (1).

305680457 is an equidigital number, since it uses as much as digits as its factorization.

305680457 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 100800, while the sum is 38.

The square root of 305680457 is about 17483.7197701176. The cubic root of 305680457 is about 673.6317648835.

The spelling of 305680457 in words is "three hundred five million, six hundred eighty thousand, four hundred fifty-seven".