51072644 has 36 divisors (see below), whose sum is σ = 104850816. Its totient is φ = 21313824.

The previous prime is 51072613. The next prime is 51072649. The reversal of 51072644 is 44627015.

It is not an unprimeable number, because it can be changed into a prime (51072649) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 259154 + ... + 259350.

Almost surely, 2^51072644 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 51072644, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (52425408).

51072644 is an abundant number, since it is smaller than the sum of its proper divisors (53778172).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

51072644 is a wasteful number, since it uses less digits than its factorization.

51072644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 452 (or 253 counting only the distinct ones).

The product of its (nonzero) digits is 6720, while the sum is 29.

The square root of 51072644 is about 7146.5127160035. The cubic root of 51072644 is about 371.0189686686.

Adding to 51072644 its reverse (44627015), we get a palindrome (95699659).

The spelling of 51072644 in words is "fifty-one million, seventy-two thousand, six hundred forty-four".