228781357 has 4 divisors (see below), whose sum is σ = 261464416. Its totient is φ = 196098300.

The previous prime is 228781313. The next prime is 228781361. The reversal of 228781357 is 753187822.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 228781357 - 2¹⁹ = 228257069 is a prime.

It is a super-2 number, since 2×228781357² = 104681818621522898, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (228781307) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16341519 + ... + 16341532.

It is an arithmetic number, because the mean of its divisors is an integer number (65366104).

Almost surely, 2^228781357 is an apocalyptic number.

It is an amenable number.

228781357 is a deficient number, since it is larger than the sum of its proper divisors (32683059).

228781357 is an equidigital number, since it uses as much as digits as its factorization.

228781357 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32683058.

The product of its digits is 188160, while the sum is 43.

The square root of 228781357 is about 15125.5200571749. The cubic root of 228781357 is about 611.6085441814.

The spelling of 228781357 in words is "two hundred twenty-eight million, seven hundred eighty-one thousand, three hundred fifty-seven".