51442272 has 288 divisors, whose sum is σ = 188697600. Its totient is φ = 12939264.

The previous prime is 51442271. The next prime is 51442327. The reversal of 51442272 is 27224415.

It is a tau number, because it is divible by the number of its divisors (288).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51442271) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 651129 + ... + 651207.

It is an arithmetic number, because the mean of its divisors is an integer number (655200).

Almost surely, 2^51442272 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 51442272, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (94348800).

51442272 is an abundant number, since it is smaller than the sum of its proper divisors (137255328).

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

51442272 is a wasteful number, since it uses less digits than its factorization.

51442272 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 138 (or 127 counting only the distinct ones).

The product of its digits is 4480, while the sum is 27.

The square root of 51442272 is about 7172.3268191013. The cubic root of 51442272 is about 371.9118764551.

Adding to 51442272 its reverse (27224415), we get a palindrome (78666687).

The spelling of 51442272 in words is "fifty-one million, four hundred forty-two thousand, two hundred seventy-two".