228660649 has 24 divisors (see below), whose sum is σ = 282659328. Its totient is φ = 181068480.

The previous prime is 228660637. The next prime is 228660671. The reversal of 228660649 is 946066822.

228660649 = 1302² + 1303² + ... + 1424².

It is not a de Polignac number, because 228660649 - 2¹¹ = 228658601 is a prime.

It is a super-2 number, since 2×228660649² = 104571384802202402, which contains 22 as substring.

It is a Smith number, since the sum of its digits (43) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (228660689) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 102504 + ... + 104710.

It is an arithmetic number, because the mean of its divisors is an integer number (11777472).

Almost surely, 2^228660649 is an apocalyptic number.

It is an amenable number.

228660649 is a deficient number, since it is larger than the sum of its proper divisors (53998679).

228660649 is a wasteful number, since it uses less digits than its factorization.

228660649 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2293 (or 2274 counting only the distinct ones).

The product of its (nonzero) digits is 248832, while the sum is 43.

The square root of 228660649 is about 15121.5293208061. The cubic root of 228660649 is about 611.5009610683.

The spelling of 228660649 in words is "two hundred twenty-eight million, six hundred sixty thousand, six hundred forty-nine".