51315726 has 64 divisors (see below), whose sum is σ = 132120576. Its totient is φ = 12895200.

The previous prime is 51315721. The next prime is 51315739. The reversal of 51315726 is 62751315.

It is a junction number, because it is equal to n+sod(n) for n = 51315693 and 51315702.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51315721) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 12531 + ... + 16113.

It is an arithmetic number, because the mean of its divisors is an integer number (2064384).

Almost surely, 2^51315726 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 51315726, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (66060288).

51315726 is an abundant number, since it is smaller than the sum of its proper divisors (80804850).

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

51315726 is a wasteful number, since it uses less digits than its factorization.

51315726 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3637.

The product of its digits is 6300, while the sum is 30.

The square root of 51315726 is about 7163.4995637607. The cubic root of 51315726 is about 371.6066631020.

The spelling of 51315726 in words is "fifty-one million, three hundred fifteen thousand, seven hundred twenty-six".