51968280 has 128 divisors (see below), whose sum is σ = 191923200. Its totient is φ = 10962432.

The previous prime is 51968243. The next prime is 51968291. The reversal of 51968280 is 8286915.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 8541 + ... + 13299.

It is an arithmetic number, because the mean of its divisors is an integer number (1499400).

Almost surely, 2^51968280 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 51968280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (95961600).

51968280 is an abundant number, since it is smaller than the sum of its proper divisors (139954920).

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

51968280 is a wasteful number, since it uses less digits than its factorization.

51968280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4793 (or 4789 counting only the distinct ones).

The product of its (nonzero) digits is 34560, while the sum is 39.

The square root of 51968280 is about 7208.9028291412. The cubic root of 51968280 is about 373.1752058511.

The spelling of 51968280 in words is "fifty-one million, nine hundred sixty-eight thousand, two hundred eighty".