51791724 has 60 divisors (see below), whose sum is σ = 143373384. Its totient is φ = 16246656.

The previous prime is 51791723. The next prime is 51791771. The reversal of 51791724 is 42719715.

It is a happy number.

51791724 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (51791723) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 807 + ... + 10209.

Almost surely, 2^51791724 is an apocalyptic number.

51791724 is a gapful number since it is divisible by the number (54) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 51791724, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (71686692).

51791724 is an abundant number, since it is smaller than the sum of its proper divisors (91581660).

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

51791724 is a wasteful number, since it uses less digits than its factorization.

51791724 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9436 (or 9425 counting only the distinct ones).

The product of its digits is 17640, while the sum is 36.

The square root of 51791724 is about 7196.6467191325. The cubic root of 51791724 is about 372.7521203560.

It can be divided in two parts, 5179 and 1724, that added together give a triangular number (6903 = T₁₁₇).

The spelling of 51791724 in words is "fifty-one million, seven hundred ninety-one thousand, seven hundred twenty-four".