227638443887 has 4 divisors (see below), whose sum is σ = 231933508920. Its totient is φ = 223343378856.

The previous prime is 227638443871. The next prime is 227638443913. The reversal of 227638443887 is 788344836722.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 227638443887 - 2⁴ = 227638443871 is a prime.

It is a super-2 number, since 2×227638443887² (a number of 24 digits) 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 (227638443287) 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, 2147532437 + ... + 2147532542.

It is an arithmetic number, because the mean of its divisors is an integer number (57983377230).

Almost surely, 2^227638443887 is an apocalyptic number.

227638443887 is a deficient number, since it is larger than the sum of its proper divisors (4295065033).

227638443887 is an equidigital number, since it uses as much as digits as its factorization.

227638443887 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4295065032.

The product of its digits is 86704128, while the sum is 62.

The spelling of 227638443887 in words is "two hundred twenty-seven billion, six hundred thirty-eight million, four hundred forty-three thousand, eight hundred eighty-seven".