657871222 has 4 divisors (see below), whose sum is σ = 986806836. Its totient is φ = 328935610.

The previous prime is 657871217. The next prime is 657871223. The reversal of 657871222 is 222178756.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (657871223) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 164467804 + ... + 164467807.

It is an arithmetic number, because the mean of its divisors is an integer number (246701709).

Almost surely, 2^657871222 is an apocalyptic number.

657871222 is a deficient number, since it is larger than the sum of its proper divisors (328935614).

657871222 is a wasteful number, since it uses less digits than its factorization.

657871222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 328935613.

The product of its digits is 94080, while the sum is 40.

The square root of 657871222 is about 25649.0004093727. Note that the first 3 decimals coincide. The cubic root of 657871222 is about 869.7216804714.

The spelling of 657871222 in words is "six hundred fifty-seven million, eight hundred seventy-one thousand, two hundred twenty-two".