51778889 has 8 divisors (see below), whose sum is σ = 55106568. Its totient is φ = 48482560.

The previous prime is 51778879. The next prime is 51778901. The reversal of 51778889 is 98887715.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 21715600 + 30063289 = 4660^2 + 5483^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-51778889 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 51778889.

It is not an unprimeable number, because it can be changed into a prime (51778829) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4382 + ... + 11079.

It is an arithmetic number, because the mean of its divisors is an integer number (6888321).

Almost surely, 2^51778889 is an apocalyptic number.

It is an amenable number.

51778889 is a deficient number, since it is larger than the sum of its proper divisors (3327679).

51778889 is a wasteful number, since it uses less digits than its factorization.

51778889 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15675.

The product of its digits is 1128960, while the sum is 53.

The square root of 51778889 is about 7195.7549291231. The cubic root of 51778889 is about 372.7213260620.

The spelling of 51778889 in words is "fifty-one million, seven hundred seventy-eight thousand, eight hundred eighty-nine".