51555168 has 144 divisors (see below), whose sum is σ = 169827840. Its totient is φ = 14531328.

The previous prime is 51555157. The next prime is 51555173. The reversal of 51555168 is 86155515.

It is a tau number, because it is divible by the number of its divisors (144).

It is a Harshad number since it is a multiple of its sum of digits (36).

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, 215593 + ... + 215831.

It is an arithmetic number, because the mean of its divisors is an integer number (1179360).

Almost surely, 2^51555168 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 51555168, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (84913920).

51555168 is an abundant number, since it is smaller than the sum of its proper divisors (118272672).

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

51555168 is a wasteful number, since it uses less digits than its factorization.

51555168 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 369 (or 358 counting only the distinct ones).

The product of its digits is 30000, while the sum is 36.

The square root of 51555168 is about 7180.1927550728. The cubic root of 51555168 is about 372.1837455075.

The spelling of 51555168 in words is "fifty-one million, five hundred fifty-five thousand, one hundred sixty-eight".