51688895 has 4 divisors (see below), whose sum is σ = 62026680. Its totient is φ = 41351112.

The previous prime is 51688883. The next prime is 51688909. The reversal of 51688895 is 59888615.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 51688895 - 2¹² = 51684799 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5168885 + ... + 5168894.

It is an arithmetic number, because the mean of its divisors is an integer number (15506670).

Almost surely, 2^51688895 is an apocalyptic number.

51688895 is a deficient number, since it is larger than the sum of its proper divisors (10337785).

51688895 is a wasteful number, since it uses less digits than its factorization.

51688895 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10337784.

The product of its digits is 691200, while the sum is 50.

The square root of 51688895 is about 7189.4989394255. The cubic root of 51688895 is about 372.5052654541.

The spelling of 51688895 in words is "fifty-one million, six hundred eighty-eight thousand, eight hundred ninety-five".