51688615 has 8 divisors (see below), whose sum is σ = 67665168. Its totient is φ = 37591680.

The previous prime is 51688603. The next prime is 51688627.

51688615 is nontrivially palindromic in base 10.

51688615 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (51688603) and next prime (51688627).

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 51688615 - 2⁹ = 51688103 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 469842 + ... + 469951.

It is an arithmetic number, because the mean of its divisors is an integer number (8458146).

Almost surely, 2^51688615 is an apocalyptic number.

51688615 is a gapful number since it is divisible by the number (55) formed by its first and last digit.

51688615 is a deficient number, since it is larger than the sum of its proper divisors (15976553).

51688615 is a wasteful number, since it uses less digits than its factorization.

51688615 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 939809.

The product of its digits is 57600, while the sum is 40.

The square root of 51688615 is about 7189.4794665539. The cubic root of 51688615 is about 372.5045928296.

The spelling of 51688615 in words is "fifty-one million, six hundred eighty-eight thousand, six hundred fifteen".