51645888 has 84 divisors (see below), whose sum is σ = 169194480. Its totient is φ = 14754816.

The previous prime is 51645887. The next prime is 51645889. The reversal of 51645888 is 88854615.

51645888 is a `hidden beast` number, since 5 + 1 + 64 + 588 + 8 = 666.

It is an interprime number because it is at equal distance from previous prime (51645887) and next prime (51645889).

It is a tau number, because it is divible by the number of its divisors (84).

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51645887) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2373 + ... + 10436.

It is an arithmetic number, because the mean of its divisors is an integer number (2014220).

Almost surely, 2^51645888 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 51645888, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (84597240).

51645888 is an abundant number, since it is smaller than the sum of its proper divisors (117548592).

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

51645888 is a wasteful number, since it uses less digits than its factorization.

51645888 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12834 (or 12821 counting only the distinct ones).

The product of its digits is 307200, while the sum is 45.

The square root of 51645888 is about 7186.5073575416. The cubic root of 51645888 is about 372.4019242421.

The spelling of 51645888 in words is "fifty-one million, six hundred forty-five thousand, eight hundred eighty-eight".