51780669 has 4 divisors (see below), whose sum is σ = 69040896. Its totient is φ = 34520444.

The previous prime is 51780667. The next prime is 51780679. The reversal of 51780669 is 96608715.

51780669 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 51780669 - 2¹ = 51780667 is a prime.

It is a super-2 number, since 2×51780669² = 5362475364175122, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 51780669.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51780667) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 8630109 + ... + 8630114.

It is an arithmetic number, because the mean of its divisors is an integer number (17260224).

Almost surely, 2^51780669 is an apocalyptic number.

It is an amenable number.

51780669 is a deficient number, since it is larger than the sum of its proper divisors (17260227).

51780669 is a wasteful number, since it uses less digits than its factorization.

51780669 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17260226.

The product of its (nonzero) digits is 90720, while the sum is 42.

The square root of 51780669 is about 7195.8786120946. The cubic root of 51780669 is about 372.7255970198.

The spelling of 51780669 in words is "fifty-one million, seven hundred eighty thousand, six hundred sixty-nine".