51502140 has 72 divisors (see below), whose sum is σ = 156854880. Its totient is φ = 13678464.

The previous prime is 51502133. The next prime is 51502159. The reversal of 51502140 is 4120515.

51502140 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, 64222 + ... + 65018.

It is an arithmetic number, because the mean of its divisors is an integer number (2178540).

Almost surely, 2^51502140 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 51502140, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (78427440).

51502140 is an abundant number, since it is smaller than the sum of its proper divisors (105352740).

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

51502140 is a wasteful number, since it uses less digits than its factorization.

51502140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1171 (or 1166 counting only the distinct ones).

The product of its (nonzero) digits is 200, while the sum is 18.

The square root of 51502140 is about 7176.4991465198. The cubic root of 51502140 is about 372.0560962924.

Adding to 51502140 its reverse (4120515), we get a palindrome (55622655).

The spelling of 51502140 in words is "fifty-one million, five hundred two thousand, one hundred forty".