228620857 has 2 divisors, whose sum is σ = 228620858. Its totient is φ = 228620856.

The previous prime is 228620849. The next prime is 228620867. The reversal of 228620857 is 758026822.

228620857 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 115326121 + 113294736 = 10739^2 + 10644^2 .

It is a cyclic number.

It is not a de Polignac number, because 228620857 - 2³ = 228620849 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (228620837) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 114310428 + 114310429.

It is an arithmetic number, because the mean of its divisors is an integer number (114310429).

Almost surely, 2^228620857 is an apocalyptic number.

It is an amenable number.

228620857 is a deficient number, since it is larger than the sum of its proper divisors (1).

228620857 is an equidigital number, since it uses as much as digits as its factorization.

228620857 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 107520, while the sum is 40.

The square root of 228620857 is about 15120.2135236246. The cubic root of 228620857 is about 611.4654874557.

The spelling of 228620857 in words is "two hundred twenty-eight million, six hundred twenty thousand, eight hundred fifty-seven".