57212228 has 24 divisors (see below), whose sum is σ = 102574080. Its totient is φ = 27911520.

The previous prime is 57212227. The next prime is 57212237. The reversal of 57212228 is 82221275.

It is a self number, because there is not a number n which added to its sum of digits gives 57212228.

It is not an unprimeable number, because it can be changed into a prime (57212227) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 44093 + ... + 45371.

It is an arithmetic number, because the mean of its divisors is an integer number (4273920).

Almost surely, 2^57212228 is an apocalyptic number.

It is an amenable number.

57212228 is a deficient number, since it is larger than the sum of its proper divisors (45361852).

57212228 is a wasteful number, since it uses less digits than its factorization.

57212228 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1547 (or 1545 counting only the distinct ones).

The product of its digits is 4480, while the sum is 29.

The square root of 57212228 is about 7563.8765193517. The cubic root of 57212228 is about 385.3271588059.

The spelling of 57212228 in words is "fifty-seven million, two hundred twelve thousand, two hundred twenty-eight".