51520230 has 48 divisors (see below), whose sum is σ = 139782240. Its totient is φ = 13140864.

The previous prime is 51520219. The next prime is 51520247. The reversal of 51520230 is 3202515.

It is a happy number.

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 (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 10375 + ... + 14514.

It is an arithmetic number, because the mean of its divisors is an integer number (2912130).

Almost surely, 2^51520230 is an apocalyptic number.

51520230 is an abundant number, since it is smaller than the sum of its proper divisors (88262010).

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

51520230 is a wasteful number, since it uses less digits than its factorization.

51520230 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24925 (or 24922 counting only the distinct ones).

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

The square root of 51520230 is about 7177.7593997013. The cubic root of 51520230 is about 372.0996524561.

Adding to 51520230 its reverse (3202515), we get a palindrome (54722745).

The spelling of 51520230 in words is "fifty-one million, five hundred twenty thousand, two hundred thirty".