51786388 has 12 divisors (see below), whose sum is σ = 90914292. Its totient is φ = 25810880.

The previous prime is 51786379. The next prime is 51786389. The reversal of 51786388 is 88368715.

It can be written as a sum of positive squares in 2 ways, for example, as 24621444 + 27164944 = 4962^2 + 5212^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51786389) 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 3 ways as a sum of consecutive naturals, for example, 19153 + ... + 21688.

It is an arithmetic number, because the mean of its divisors is an integer number (7576191).

Almost surely, 2^51786388 is an apocalyptic number.

It is an amenable number.

51786388 is a deficient number, since it is larger than the sum of its proper divisors (39127904).

51786388 is a wasteful number, since it uses less digits than its factorization.

51786388 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41162 (or 41160 counting only the distinct ones).

The product of its digits is 322560, while the sum is 46.

The square root of 51786388 is about 7196.2759813670. The cubic root of 51786388 is about 372.7393186091.

The spelling of 51786388 in words is "fifty-one million, seven hundred eighty-six thousand, three hundred eighty-eight".