51866890 has 8 divisors (see below), whose sum is σ = 93360420. Its totient is φ = 20746752.

The previous prime is 51866869. The next prime is 51866921. The reversal of 51866890 is 9866815.

51866890 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 2 ways, for example, as 49970761 + 1896129 = 7069^2 + 1377^2 .

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

It is an unprimeable number.

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, 2593335 + ... + 2593354.

Almost surely, 2^51866890 is an apocalyptic number.

51866890 is a deficient number, since it is larger than the sum of its proper divisors (41493530).

51866890 is a wasteful number, since it uses less digits than its factorization.

51866890 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5186696.

The product of its (nonzero) digits is 103680, while the sum is 43.

The square root of 51866890 is about 7201.8671190185. The cubic root of 51866890 is about 372.9323598499.

The spelling of 51866890 in words is "fifty-one million, eight hundred sixty-six thousand, eight hundred ninety".