228142385 has 4 divisors (see below), whose sum is σ = 273770868. Its totient is φ = 182513904.

The previous prime is 228142337. The next prime is 228142403. The reversal of 228142385 is 583241822.

228142385 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 159567424 + 68574961 = 12632^2 + 8281^2 .

It is a cyclic number.

It is not a de Polignac number, because 228142385 - 2¹² = 228138289 is a prime.

It is a Duffinian number.

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, 22814234 + ... + 22814243.

It is an arithmetic number, because the mean of its divisors is an integer number (68442717).

Almost surely, 2^228142385 is an apocalyptic number.

It is an amenable number.

228142385 is a deficient number, since it is larger than the sum of its proper divisors (45628483).

228142385 is an equidigital number, since it uses as much as digits as its factorization.

228142385 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45628482.

The product of its digits is 30720, while the sum is 35.

The square root of 228142385 is about 15104.3829731638. The cubic root of 228142385 is about 611.0386184778.

The spelling of 228142385 in words is "two hundred twenty-eight million, one hundred forty-two thousand, three hundred eighty-five".