51247688 has 12 divisors (see below), whose sum is σ = 96127395. Its totient is φ = 25613720.

The previous prime is 51247687. The next prime is 51247699. The reversal of 51247688 is 88674215.

It is a powerful number, because all its prime factors have an exponent greater than 1 and also an Achilles number because it is not a perfect power.

51247688 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 25623844 + 25623844 = 5062^2 + 5062^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=5062.

It is a super-3 number, since 3×51247688³ (a number of 24 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51247687) 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 2 ways as a sum of consecutive naturals, for example, 18983 + ... + 21513.

Almost surely, 2^51247688 is an apocalyptic number.

It is an amenable number.

51247688 is a deficient number, since it is larger than the sum of its proper divisors (44879707).

51247688 is an frugal number, since it uses more digits than its factorization.

51247688 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5068 (or 2533 counting only the distinct ones).

The product of its digits is 107520, while the sum is 41.

The square root of 51247688 is about 7158.7490527326. The cubic root of 51247688 is about 371.4423563777.

The spelling of 51247688 in words is "fifty-one million, two hundred forty-seven thousand, six hundred eighty-eight".