51210072 has 96 divisors (see below), whose sum is σ = 145828800. Its totient is φ = 16215552.

The previous prime is 51210037. The next prime is 51210113. The reversal of 51210072 is 27001215.

51210072 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (18).

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 in 23 ways as a sum of consecutive naturals, for example, 125004 + ... + 125412.

It is an arithmetic number, because the mean of its divisors is an integer number (1519050).

Almost surely, 2^51210072 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 51210072, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (72914400).

51210072 is an abundant number, since it is smaller than the sum of its proper divisors (94618728).

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

51210072 is a wasteful number, since it uses less digits than its factorization.

51210072 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 505 (or 498 counting only the distinct ones).

The product of its (nonzero) digits is 140, while the sum is 18.

The square root of 51210072 is about 7156.1212957859. The cubic root of 51210072 is about 371.3514540940.

Adding to 51210072 its reverse (27001215), we get a palindrome (78211287).

The spelling of 51210072 in words is "fifty-one million, two hundred ten thousand, seventy-two".