51820286 has 16 divisors (see below), whose sum is σ = 89099136. Its totient is φ = 22142616.

The previous prime is 51820261. The next prime is 51820297. The reversal of 51820286 is 68202815.

It is a super-2 number, since 2×51820286² = 5370684082243592, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 476 + ... + 10191.

It is an arithmetic number, because the mean of its divisors is an integer number (5568696).

Almost surely, 2^51820286 is an apocalyptic number.

51820286 is a deficient number, since it is larger than the sum of its proper divisors (37278850).

51820286 is a wasteful number, since it uses less digits than its factorization.

51820286 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11023.

The product of its (nonzero) digits is 7680, while the sum is 32.

The square root of 51820286 is about 7198.6308420421. The cubic root of 51820286 is about 372.8206293038.

The spelling of 51820286 in words is "fifty-one million, eight hundred twenty thousand, two hundred eighty-six".