51723120 has 80 divisors (see below), whose sum is σ = 163016352. Its totient is φ = 13562880.

The previous prime is 51723107. The next prime is 51723127. The reversal of 51723120 is 2132715.

51723120 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (80).

It is a super-2 number, since 2×51723120² = 5350562285068800, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51723127) 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 15 ways as a sum of consecutive naturals, for example, 12874 + ... + 16406.

Almost surely, 2^51723120 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 51723120, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (81508176).

51723120 is an abundant number, since it is smaller than the sum of its proper divisors (111293232).

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

51723120 is a wasteful number, since it uses less digits than its factorization.

51723120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3610 (or 3604 counting only the distinct ones).

The product of its (nonzero) digits is 420, while the sum is 21.

The square root of 51723120 is about 7191.8787531493. The cubic root of 51723120 is about 372.5874635091.

Adding to 51723120 its reverse (2132715), we get a palindrome (53855835).

The spelling of 51723120 in words is "fifty-one million, seven hundred twenty-three thousand, one hundred twenty".