228710381 has 4 divisors (see below), whose sum is σ = 230245500. Its totient is φ = 227175264.

The previous prime is 228710371. The next prime is 228710389. The reversal of 228710381 is 183017822.

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 100681156 + 128029225 = 10034^2 + 11315^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-228710381 is a prime.

It is a super-2 number, since 2×228710381² = 104616876754330322, 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 (228710389) 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, 767336 + ... + 767633.

It is an arithmetic number, because the mean of its divisors is an integer number (57561375).

Almost surely, 2^228710381 is an apocalyptic number.

It is an amenable number.

228710381 is a deficient number, since it is larger than the sum of its proper divisors (1535119).

228710381 is a wasteful number, since it uses less digits than its factorization.

228710381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1535118.

The product of its (nonzero) digits is 5376, while the sum is 32.

The square root of 228710381 is about 15123.1736417989. The cubic root of 228710381 is about 611.5452901669.

The spelling of 228710381 in words is "two hundred twenty-eight million, seven hundred ten thousand, three hundred eighty-one".