228672985 has 4 divisors (see below), whose sum is σ = 274407588. Its totient is φ = 182938384.

The previous prime is 228672959. The next prime is 228672991. The reversal of 228672985 is 589276822.

It is a happy number.

228672985 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 24840256 + 203832729 = 4984^2 + 14277^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-228672985 is a prime.

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 22867294 + ... + 22867303.

It is an arithmetic number, because the mean of its divisors is an integer number (68601897).

Almost surely, 2^228672985 is an apocalyptic number.

It is an amenable number.

228672985 is a deficient number, since it is larger than the sum of its proper divisors (45734603).

228672985 is an equidigital number, since it uses as much as digits as its factorization.

228672985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45734602.

The product of its digits is 967680, while the sum is 49.

The square root of 228672985 is about 15121.9372105561. The cubic root of 228672985 is about 611.5119574804.

It can be divided in two parts, 22867 and 2985, that added together give a palindrome (25852).

The spelling of 228672985 in words is "two hundred twenty-eight million, six hundred seventy-two thousand, nine hundred eighty-five".