51502230 has 160 divisors (see below), whose sum is σ = 153435744. Its totient is φ = 12317184.

The previous prime is 51502207. The next prime is 51502249. The reversal of 51502230 is 3220515.

It is a happy number.

51502230 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 79 ways as a sum of consecutive naturals, for example, 705474 + ... + 705546.

Almost surely, 2^51502230 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 51502230, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (76717872).

51502230 is an abundant number, since it is smaller than the sum of its proper divisors (101933514).

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

51502230 is a wasteful number, since it uses less digits than its factorization.

51502230 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 172 (or 163 counting only the distinct ones).

The product of its (nonzero) digits is 300, while the sum is 18.

The square root of 51502230 is about 7176.5054169840. The cubic root of 51502230 is about 372.0563130150.

Adding to 51502230 its reverse (3220515), we get a palindrome (54722745).

The spelling of 51502230 in words is "fifty-one million, five hundred two thousand, two hundred thirty".