228133557 has 32 divisors (see below), whose sum is σ = 369423360. Its totient is φ = 138516480.

The previous prime is 228133547. The next prime is 228133559. The reversal of 228133557 is 755331822.

It is a happy number.

228133557 is a `hidden beast` number, since 22 + 81 + 3 + 3 + 557 = 666.

228133557 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 228133557 - 2¹⁶ = 228068021 is a prime.

It is a super-4 number, since 4×228133557⁴ (a number of 35 digits) contains 4444 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (228133559) 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, 6213 + ... + 22245.

It is an arithmetic number, because the mean of its divisors is an integer number (11544480).

Almost surely, 2^228133557 is an apocalyptic number.

228133557 is a gapful number since it is divisible by the number (27) formed by its first and last digit.

It is an amenable number.

228133557 is a deficient number, since it is larger than the sum of its proper divisors (141289803).

228133557 is a wasteful number, since it uses less digits than its factorization.

228133557 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16090 (or 16084 counting only the distinct ones).

The product of its digits is 50400, while the sum is 36.

The square root of 228133557 is about 15104.0907372804. The cubic root of 228133557 is about 611.0307369692.

The spelling of 228133557 in words is "two hundred twenty-eight million, one hundred thirty-three thousand, five hundred fifty-seven".