51690850 has 24 divisors (see below), whose sum is σ = 98747028. Its totient is φ = 20116800.

The previous prime is 51690841. The next prime is 51690853. The reversal of 51690850 is 5809615.

51690850 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 6 ways, for example, as 29909961 + 21780889 = 5469^2 + 4667^2 .

It is not an unprimeable number, because it can be changed into a prime (51690853) 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 11 ways as a sum of consecutive naturals, for example, 12121 + ... + 15820.

Almost surely, 2^51690850 is an apocalyptic number.

51690850 is a gapful number since it is divisible by the number (50) formed by its first and last digit.

51690850 is a deficient number, since it is larger than the sum of its proper divisors (47056178).

51690850 is a wasteful number, since it uses less digits than its factorization.

51690850 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27990 (or 27985 counting only the distinct ones).

The product of its (nonzero) digits is 10800, while the sum is 34.

The square root of 51690850 is about 7189.6349003270. The cubic root of 51690850 is about 372.5099617473.

The spelling of 51690850 in words is "fifty-one million, six hundred ninety thousand, eight hundred fifty".