918644228 has 24 divisors (see below), whose sum is σ = 1625944320. Its totient is φ = 454104000.

The previous prime is 918644197. The next prime is 918644231. The reversal of 918644228 is 822446819.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 307928 + ... + 310896.

It is an arithmetic number, because the mean of its divisors is an integer number (67747680).

Almost surely, 2^918644228 is an apocalyptic number.

It is an amenable number.

918644228 is a deficient number, since it is larger than the sum of its proper divisors (707300092).

918644228 is a wasteful number, since it uses less digits than its factorization.

918644228 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3827 (or 3825 counting only the distinct ones).

The product of its digits is 221184, while the sum is 44.

The square root of 918644228 is about 30309.1442967300. The cubic root of 918644228 is about 972.1108345673.

The spelling of 918644228 in words is "nine hundred eighteen million, six hundred forty-four thousand, two hundred twenty-eight".