228633397 has 16 divisors (see below), whose sum is σ = 239118192. Its totient is φ = 218419200.

The previous prime is 228633389. The next prime is 228633407. The reversal of 228633397 is 793336822.

228633397 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 8 ways, for example, as 2852721 + 225780676 = 1689^2 + 15026^2 .

It is a cyclic number.

It is not a de Polignac number, because 228633397 - 2³ = 228633389 is a prime.

It is a Duffinian number.

Its product of digits (326592) is a multiple of the sum of its prime divisors (648).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (228633367) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 721083 + ... + 721399.

It is an arithmetic number, because the mean of its divisors is an integer number (14944887).

Almost surely, 2^228633397 is an apocalyptic number.

It is an amenable number.

228633397 is a deficient number, since it is larger than the sum of its proper divisors (10484795).

228633397 is a wasteful number, since it uses less digits than its factorization.

228633397 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 648.

The product of its digits is 326592, while the sum is 43.

The square root of 228633397 is about 15120.6281946221. The cubic root of 228633397 is about 611.4766670088.

The spelling of 228633397 in words is "two hundred twenty-eight million, six hundred thirty-three thousand, three hundred ninety-seven".