228142257 has 32 divisors (see below), whose sum is σ = 355096320. Its totient is φ = 127595520.

The previous prime is 228142249. The next prime is 228142279. The reversal of 228142257 is 752241822.

228142257 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 228142257 - 2³ = 228142249 is a prime.

It is not an unprimeable number, because it can be changed into a prime (228142457) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 400669 + ... + 401237.

It is an arithmetic number, because the mean of its divisors is an integer number (11096760).

Almost surely, 2^228142257 is an apocalyptic number.

It is an amenable number.

228142257 is a deficient number, since it is larger than the sum of its proper divisors (126954063).

228142257 is a wasteful number, since it uses less digits than its factorization.

228142257 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 953.

The product of its digits is 17920, while the sum is 33.

The square root of 228142257 is about 15104.3787359825. The cubic root of 228142257 is about 611.0385042027.

The spelling of 228142257 in words is "two hundred twenty-eight million, one hundred forty-two thousand, two hundred fifty-seven".