51297750 has 96 divisors (see below), whose sum is σ = 158573376. Its totient is φ = 11721600.

The previous prime is 51297749. The next prime is 51297773. The reversal of 51297750 is 5779215.

51297750 is a `hidden beast` number, since 512 + 97 + 7 + 50 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 14122 + ... + 17378.

It is an arithmetic number, because the mean of its divisors is an integer number (1651806).

It is a vampire number, since it can be written as 5250 ⋅ 9771 (with its own digits).

Almost surely, 2^51297750 is an apocalyptic number.

51297750 is a gapful number since it is divisible by the number (50) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 51297750, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (79286688).

51297750 is an abundant number, since it is smaller than the sum of its proper divisors (107275626).

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

51297750 is a wasteful number, since it uses less digits than its factorization.

51297750 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3287 (or 3274 counting only the distinct ones).

The product of its (nonzero) digits is 22050, while the sum is 36.

The square root of 51297750 is about 7162.2447598501. The cubic root of 51297750 is about 371.5632665187.

The spelling of 51297750 in words is "fifty-one million, two hundred ninety-seven thousand, seven hundred fifty".