51782689 has 4 divisors (see below), whose sum is σ = 59180224. Its totient is φ = 44385156.

The previous prime is 51782681. The next prime is 51782693. The reversal of 51782689 is 98628715.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 51782689 - 2³ = 51782681 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51782681) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3698757 + ... + 3698770.

It is an arithmetic number, because the mean of its divisors is an integer number (14795056).

Almost surely, 2^51782689 is an apocalyptic number.

It is an amenable number.

51782689 is a deficient number, since it is larger than the sum of its proper divisors (7397535).

51782689 is an equidigital number, since it uses as much as digits as its factorization.

51782689 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7397534.

The product of its digits is 241920, while the sum is 46.

The square root of 51782689 is about 7196.0189688466. The cubic root of 51782689 is about 372.7304437186.

The spelling of 51782689 in words is "fifty-one million, seven hundred eighty-two thousand, six hundred eighty-nine".