51216284 has 24 divisors (see below), whose sum is σ = 103221888. Its totient is φ = 21780720.

The previous prime is 51216283. The next prime is 51216287. The reversal of 51216284 is 48261215.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51216283) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3314 + ... + 10649.

It is an arithmetic number, because the mean of its divisors is an integer number (4300912).

Almost surely, 2^51216284 is an apocalyptic number.

It is an amenable number.

51216284 is an abundant number, since it is smaller than the sum of its proper divisors (52005604).

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

51216284 is a wasteful number, since it uses less digits than its factorization.

51216284 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14105 (or 14103 counting only the distinct ones).

The product of its digits is 3840, while the sum is 29.

The square root of 51216284 is about 7156.5553166310. Note that the first 3 decimals coincide. The cubic root of 51216284 is about 371.3664689916.

Adding to 51216284 its reverse (48261215), we get a palindrome (99477499).

The spelling of 51216284 in words is "fifty-one million, two hundred sixteen thousand, two hundred eighty-four".