51645230 has 128 divisors (see below), whose sum is σ = 125798400. Its totient is φ = 14805504.

The previous prime is 51645227. The next prime is 51645233. The reversal of 51645230 is 3254615.

It is an interprime number because it is at equal distance from previous prime (51645227) and next prime (51645233).

It is a Harshad number since it is a multiple of its sum of digits (26).

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 51645230.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51645233) by changing a digit.

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 63 ways as a sum of consecutive naturals, for example, 501359 + ... + 501461.

It is an arithmetic number, because the mean of its divisors is an integer number (982800).

Almost surely, 2^51645230 is an apocalyptic number.

51645230 is an abundant number, since it is smaller than the sum of its proper divisors (74153170).

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

51645230 is a wasteful number, since it uses less digits than its factorization.

51645230 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 178.

The product of its (nonzero) digits is 3600, while the sum is 26.

The square root of 51645230 is about 7186.4615771602. The cubic root of 51645230 is about 372.4003426932.

Adding to 51645230 its reverse (3254615), we get a palindrome (54899845).

The spelling of 51645230 in words is "fifty-one million, six hundred forty-five thousand, two hundred thirty".