51571968 has 144 divisors (see below), whose sum is σ = 160707456. Its totient is φ = 14376960.

The previous prime is 51571963. The next prime is 51572041. The reversal of 51571968 is 86917515.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51571963) 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, 284838 + ... + 285018.

It is an arithmetic number, because the mean of its divisors is an integer number (1116024).

Almost surely, 2^51571968 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 51571968, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (80353728).

51571968 is an abundant number, since it is smaller than the sum of its proper divisors (109135488).

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

51571968 is a wasteful number, since it uses less digits than its factorization.

51571968 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 260 (or 246 counting only the distinct ones).

The product of its digits is 75600, while the sum is 42.

The square root of 51571968 is about 7181.3625448100. The cubic root of 51571968 is about 372.2241682761.

The spelling of 51571968 in words is "fifty-one million, five hundred seventy-one thousand, nine hundred sixty-eight".