51688413 has 24 divisors (see below), whose sum is σ = 87412416. Its totient is φ = 28814400.

The previous prime is 51688397. The next prime is 51688447. The reversal of 51688413 is 31488615.

It is not a de Polignac number, because 51688413 - 2⁴ = 51688397 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51688463) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 7423 + ... + 12588.

It is an arithmetic number, because the mean of its divisors is an integer number (3642184).

Almost surely, 2^51688413 is an apocalyptic number.

It is an amenable number.

51688413 is a deficient number, since it is larger than the sum of its proper divisors (35724003).

51688413 is a wasteful number, since it uses less digits than its factorization.

51688413 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20065 (or 20062 counting only the distinct ones).

The product of its digits is 23040, while the sum is 36.

The square root of 51688413 is about 7189.4654182352. The cubic root of 51688413 is about 372.5041075775.

The spelling of 51688413 in words is "fifty-one million, six hundred eighty-eight thousand, four hundred thirteen".