51663360 has 240 divisors, whose sum is σ = 195041088. Its totient is φ = 11427840.

The previous prime is 51663347. The next prime is 51663371. The reversal of 51663360 is 6336615.

It is a tau number, because it is divible by the number of its divisors (240).

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1666545 + ... + 1666575.

Almost surely, 2^51663360 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 51663360, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (97520544).

51663360 is an abundant number, since it is smaller than the sum of its proper divisors (143377728).

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

51663360 is an equidigital number, since it uses as much as digits as its factorization.

51663360 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 95 (or 48 counting only the distinct ones).

The product of its (nonzero) digits is 9720, while the sum is 30.

The square root of 51663360 is about 7187.7228661100. The cubic root of 51663360 is about 372.4439145023.

Adding to 51663360 its reverse (6336615), we get a palindrome (57999975).

The spelling of 51663360 in words is "fifty-one million, six hundred sixty-three thousand, three hundred sixty".