226208781 has 20 divisors (see below), whose sum is σ = 341998272. Its totient is φ = 148984488.

The previous prime is 226208779. The next prime is 226208789. The reversal of 226208781 is 187802622.

It is a happy number.

226208781 is a `hidden beast` number, since 22 + 620 + 8 + 7 + 8 + 1 = 666.

It is not a de Polignac number, because 226208781 - 2¹ = 226208779 is a prime.

It is a super-2 number, since 2×226208781² = 102340825203011922, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (226208789) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 10101 + ... + 23546.

Almost surely, 2^226208781 is an apocalyptic number.

It is an amenable number.

226208781 is a deficient number, since it is larger than the sum of its proper divisors (115789491).

226208781 is an equidigital number, since it uses as much as digits as its factorization.

226208781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33742 (or 33733 counting only the distinct ones).

The product of its (nonzero) digits is 21504, while the sum is 36.

The square root of 226208781 is about 15040.2387281585. The cubic root of 226208781 is about 609.3074474703.

The spelling of 226208781 in words is "two hundred twenty-six million, two hundred eight thousand, seven hundred eighty-one".