51688395 has 32 divisors (see below), whose sum is σ = 100247040. Its totient is φ = 25060320.

The previous prime is 51688393. The next prime is 51688397. The reversal of 51688395 is 59388615.

It is an interprime number because it is at equal distance from previous prime (51688393) and next prime (51688397).

It is not a de Polignac number, because 51688395 - 2¹ = 51688393 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 51688395.

It is not an unprimeable number, because it can be changed into a prime (51688393) 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, 15919 + ... + 18888.

It is an arithmetic number, because the mean of its divisors is an integer number (3132720).

Almost surely, 2^51688395 is an apocalyptic number.

51688395 is a gapful number since it is divisible by the number (55) formed by its first and last digit.

51688395 is a deficient number, since it is larger than the sum of its proper divisors (48558645).

51688395 is a wasteful number, since it uses less digits than its factorization.

51688395 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34832 (or 34826 counting only the distinct ones).

The product of its digits is 259200, while the sum is 45.

The square root of 51688395 is about 7189.4641664035. The cubic root of 51688395 is about 372.5040643371.

The spelling of 51688395 in words is "fifty-one million, six hundred eighty-eight thousand, three hundred ninety-five".