51891168 has 96 divisors (see below), whose sum is σ = 159957504. Its totient is φ = 14418432.

The previous prime is 51891167. The next prime is 51891173. The reversal of 51891168 is 86119815.

It is a tau number, because it is divible by the number of its divisors (96).

It is a hoax number, since the sum of its digits (39) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51891167) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 23821 + ... + 25907.

It is an arithmetic number, because the mean of its divisors is an integer number (1666224).

Almost surely, 2^51891168 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 51891168, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (79978752).

51891168 is an abundant number, since it is smaller than the sum of its proper divisors (108066336).

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

51891168 is a wasteful number, since it uses less digits than its factorization.

51891168 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2144 (or 2136 counting only the distinct ones).

The product of its digits is 17280, while the sum is 39.

The square root of 51891168 is about 7203.5524569479. The cubic root of 51891168 is about 372.9905385166.

The spelling of 51891168 in words is "fifty-one million, eight hundred ninety-one thousand, one hundred sixty-eight".