51222644 has 24 divisors (see below), whose sum is σ = 97977600. Its totient is φ = 23238080.

The previous prime is 51222641. The next prime is 51222659. The reversal of 51222644 is 44622215.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51222641) 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, 34877 + ... + 36315.

It is an arithmetic number, because the mean of its divisors is an integer number (4082400).

Almost surely, 2^51222644 is an apocalyptic number.

It is an amenable number.

51222644 is a deficient number, since it is larger than the sum of its proper divisors (46754956).

51222644 is a wasteful number, since it uses less digits than its factorization.

51222644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2263 (or 2261 counting only the distinct ones).

The product of its digits is 3840, while the sum is 26.

The square root of 51222644 is about 7156.9996506916. Note that the first 3 decimals coincide. The cubic root of 51222644 is about 371.3818403592.

Adding to 51222644 its reverse (44622215), we get a palindrome (95844859).

The spelling of 51222644 in words is "fifty-one million, two hundred twenty-two thousand, six hundred forty-four".