225215644 has 6 divisors (see below), whose sum is σ = 394127384. Its totient is φ = 112607820.

The previous prime is 225215629. The next prime is 225215687. The reversal of 225215644 is 446512522.

It is a congruent number.

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 28151952 + ... + 28151959.

Almost surely, 2^225215644 is an apocalyptic number.

It is an amenable number.

225215644 is a deficient number, since it is larger than the sum of its proper divisors (168911740).

225215644 is a wasteful number, since it uses less digits than its factorization.

225215644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 56303915 (or 56303913 counting only the distinct ones).

The product of its digits is 19200, while the sum is 31.

The square root of 225215644 is about 15007.1864118495. The cubic root of 225215644 is about 608.4144471978.

The spelling of 225215644 in words is "two hundred twenty-five million, two hundred fifteen thousand, six hundred forty-four".