51778766 has 8 divisors (see below), whose sum is σ = 83642664. Its totient is φ = 23897880.

The previous prime is 51778729. The next prime is 51778801. The reversal of 51778766 is 66787715.

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

It is a self number, because there is not a number n which added to its sum of digits gives 51778766.

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, 995720 + ... + 995771.

It is an arithmetic number, because the mean of its divisors is an integer number (10455333).

Almost surely, 2^51778766 is an apocalyptic number.

51778766 is a deficient number, since it is larger than the sum of its proper divisors (31863898).

51778766 is a wasteful number, since it uses less digits than its factorization.

51778766 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1991506.

The product of its digits is 493920, while the sum is 47.

The square root of 51778766 is about 7195.7463824123. The cubic root of 51778766 is about 372.7210309304.

It can be divided in two parts, 5 and 1778766, that added together give a palindrome (1778771).

The spelling of 51778766 in words is "fifty-one million, seven hundred seventy-eight thousand, seven hundred sixty-six".