228646731 has 16 divisors (see below), whose sum is σ = 319016960. Its totient is φ = 145488960.

The previous prime is 228646721. The next prime is 228646739. The reversal of 228646731 is 137646822.

It is a happy number.

It is not a de Polignac number, because 228646731 - 2⁵ = 228646699 is a prime.

It is a super-2 number, since 2×228646731² = 104558655193972722, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 228646731.

It is not an unprimeable number, because it can be changed into a prime (228646739) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10051 + ... + 23628.

It is an arithmetic number, because the mean of its divisors is an integer number (19938560).

Almost surely, 2^228646731 is an apocalyptic number.

228646731 is a deficient number, since it is larger than the sum of its proper divisors (90370229).

228646731 is a wasteful number, since it uses less digits than its factorization.

228646731 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33786.

The product of its digits is 96768, while the sum is 39.

The square root of 228646731 is about 15121.0691090280. The cubic root of 228646731 is about 611.4885539735.

Subtracting from 228646731 its reverse (137646822), we obtain a palindrome (90999909).

The spelling of 228646731 in words is "two hundred twenty-eight million, six hundred forty-six thousand, seven hundred thirty-one".