51643384 has 32 divisors (see below), whose sum is σ = 104580000. Its totient is φ = 23766912.

The previous prime is 51643381. The next prime is 51643391. The reversal of 51643384 is 48334615.

It is a happy number.

It is a super-2 number, since 2×51643384² = 5334078221942912, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51643381) 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 7 ways as a sum of consecutive naturals, for example, 61882 + ... + 62710.

It is an arithmetic number, because the mean of its divisors is an integer number (3268125).

Almost surely, 2^51643384 is an apocalyptic number.

It is an amenable number.

51643384 is an abundant number, since it is smaller than the sum of its proper divisors (52936616).

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

51643384 is a wasteful number, since it uses less digits than its factorization.

51643384 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1447 (or 1443 counting only the distinct ones).

The product of its digits is 34560, while the sum is 34.

The square root of 51643384 is about 7186.3331400652. Note that the first 3 decimals coincide. The cubic root of 51643384 is about 372.3959056314.

Adding to 51643384 its reverse (48334615), we get a palindrome (99977999).

The spelling of 51643384 in words is "fifty-one million, six hundred forty-three thousand, three hundred eighty-four".